Question 1: Which Category Of The Periodic Table Describes T

Question 1which Category Of The Periodic Table Describes The Element K

Question 1which Category Of The Periodic Table Describes The Element K

Question 1Which category of the periodic table describes the element K? Answer metal nonmetal metaloid

Question 2 Which category of the periodic table describes the element hydrogen? Answer metal nonmetal metaloid

Question 3 Cl- has protons, neutrons, and electrons.

Question 4 How many electrons are in carbon-12 with a -1 charge? Answer

Question 5 Mn2+ has protons, neutrons, and electrons.

Question 6 Silver-107 with a +1 charge would have protons, neutrons, and electrons.

Question 7 S2- has protons, neutrons, and electrons.

Question 8 A species with an atomic number of 33, an atomic mass of 75, and a total of 36 electrons would be which of the following? Answer 42As3+ 42AsAsAs3+

Question 9 How many electrons are in 13C+? Answer

Question 10 How many protons are there in phosphorus-31?

Question 11 Which of the following is the correct symbol for the element: gold Answer Go G Au Ag

Question 12 Give the name of the element that has the symbol: V Answer

Question 13 Which of the following is the correct symbol for the element: silver Answer Si S Sr Ag

Question 14 Give the name of the element that has the symbol: P Answer

Question 15 Give the name (not the atomic symbol) of the first element in the fourth period of the periodic table. Answer

Question 16 Give the name of the element that has the symbol: Co Answer

Question 17 Which of the following is the correct symbol for the element: cesium Answer Ce C Cm Cs

Question 18 Give the name of the element that has the symbol: Tl Answer

Question 19 Indicate all of the following statements that are true. Answer The proton and electron have the same mass. The neutron has no charge. The proton and electron have charges of the same magnitude but opposite sign. The neutron and the electron have approximately the same mass.

Question 20 Which of the subatomic particles has the smallest mass? Answer Proton Neutron Electron

Question 21 How many total atoms are in the molecule: (NH4)2SO4 Answer

Question 22 How many total atoms are in the molecule: FeCl3 Answer

Question 23 Name the following compound: H2SO3 Answer

Question 24 Name the following compound: ZnO Answer

Question 25 Name the following compound: TiO2 Answer

Question 26 Name the following compound: Zn(IO4)2 Answer

Question 27 Name the following compound: PbCrO4 Answer

Question 28 Name the following compound: P2O5 Answer

Question 29 Name the following compound: CdBr2 Answer

Question 30 Name the following compound: CaSO4 Answer

Question 31 Name the following compound: CaI2 Answer

Question 32 Name the following compound: Fe(OH)3 Answer

Question 33 Which of the following is the correct formula for rubidium hydrogen phosphate? Answer RbHPO4 RbHPO3 Rb2HPO4 Rb2HPO3 Rb(HPO4)2 Rb(HPO3)2 Rb3(HPO4) Rb3(HPO3)

Question 34 Which of the following is the correct formula for calcium chloride? Answer CaCl CaCl2 Ca2Cl Ca2Cl2 CaClO2 Ca(ClO2)2 CaClO3 Ca(ClO3)2

Question 35 Which of the following is the correct formula for beryllium carbonate? Answer BeCO3 Be(CO3)2 Be2(CO3) Be2(CO3)2 BeC Be2C Be4C2 Be2C4

Question 36 Which of the following is the correct formula for iron(II) phosphite? Answer FePO4 FePO3 Fe2PO4 Fe2PO3 Fe3(PO4)2 Fe3(PO3)2 Fe2(PO4)3 Fe2(PO3)3

Question 37 Which of the following is the correct formula for nickel(II) perbromate? Answer NiBr2 Ni2Br2 NiBrO Ni(BrO)2 NiBrO2 Ni(BrO2)2 Ni(BrO3)2 Ni(BrO4)2

Question 38 Which of the following is the correct formula for sodium silicate? Answer NaSi Na2Si Na3Si Na4Si NaSiO3 Na2SiO3 Na3SiO3 Na4SiO3

Question 39 Which of the following is the correct formula for scandium(III) dichromate? Answer Sc3Cr2O7 Sc(Cr2O7)3 Sc2(Cr2O7)3 Sc3(Cr2O7)2 Sc3(CrO4)2 Sc2(CrO4)3 Sc3Cr2O4 Sc2Cr2O4

Question 40 Which of the following is the correct formula for sodium oxide? Answer NaO NaO2 Na2O Na2O2 Na3O NaO3 Na2O3 Na3O2

Question 41 Which of the following is the correct formula for zinc hydrogen carbonate? Answer ZnHCO3 Zn(HCO3)2 Zn2(HCO3) Zn2(HCO3)2 ZnH(CO3)2 ZnH2(CO3)2 (ZnH)2(CO3)3 (ZnH)3(CO3)

Paper For Above instruction

The periodic table is a foundational tool in chemistry, organizing elements based on their atomic structures and properties. The classification of elements into categories such as metals, nonmetals, and metalloids provides insight into their reactivity, conductivity, and other chemical behaviors. This paper explores the categorization of various elements, their atomic compositions, and compound nomenclature, emphasizing the importance of understanding electron configuration and molecular formulas for chemists and students alike.

Classification of Elements in the Periodic Table

The element potassium (K) is classified as an alkali metal, which is a group within the s-block of the periodic table. Alkali metals are characterized by having a single valence electron, high reactivity, and a tendency to form +1 ions. They are soft, shiny, and good conductors of electricity. Thus, potassium (K) belongs to the metal category and exhibits properties typical of alkali metals, including reactivity with water and air.

Hydrogen, although unique, is often grouped with nonmetals because of its gaseous form, poor conductivity, and nonmetallic properties. It is placed atop Group 1, but chemically it behaves more like a nonmetal, forming covalent compounds and diatomic molecules (H₂). Its distinct nature has made it a special case—commonly regarded as a nonmetal in the periodic table, despite its position.

Understanding Atomic Particles and Electron Counts

Cl- (chloride ion) contains 17 protons, 18 neutrons (assuming isotopic mass), and 18 electrons due to gaining an extra electron. For ions such as carbon-12 with a -1 charge, the number of electrons exceeds protons; specifically, carbon-12 has 6 protons, 6 neutrons, and with a -1 charge, it has 7 electrons. For mn2+ and other ions, the electron count decreases relative to the neutral atom due to loss of electrons. For example, Mn2+ would have 25 protons, 30 neutrons, and 23 electrons, reflecting the 2-electron loss from neutral manganese (atomic number 25).

Silver-107 with a +1 charge has 47 protons, 60 neutrons, and 46 electrons. Similarly, S2- (sulfide ion) has gained two electrons, giving it 16 protons and 18 electrons. These variations in electron count influence the ionic properties and reactivity of the elements.

Atomic Number, Mass, and Electron Counts

An atom with an atomic number of 33 (arsenic) has 33 protons. If it has 36 electrons, it is a negatively charged ion, specifically arsine (As⁻). The atomic mass provides insights into neutrons; for arsenic, approximately 75 amu, neutrons are approximately 42 (75 - 33).

The identification of elements through their symbols and names is fundamental. For example, gold's symbol is Au, derived from its Latin name 'Aurum'. The element with symbol V is vanadium, a transition metal, important in steel alloys. Silver's correct symbol is Ag, from Latin 'Argentum'. Phosphorus, symbol P, is a nonmetal essential in biological molecules.

Periodicity and Element Naming

The first element in the fourth period of the periodic table is potassium (K), a metal with atomic number 19. Transition metals like cobalt (Co) and cesium (Cs) are found in this period, each with distinct properties. The correct symbols are vital for precise chemical communication, with silver (Ag) and cesium (Cs) being examples.

Subatomic Particles and Atomic Structure

Protons, neutrons, and electrons are the fundamental subatomic particles. The neutron is the heaviest, nearly equal in mass to the proton, but it carries no charge. Electrons are much lighter and negatively charged. In terms of mass, the smallest subatomic particle is the electron, which plays a critical role in chemical bonding and electricity.

Chemical Nomenclature and Molecular Formulas

Counting atoms in molecules like ammonium sulfate ((NH₄)₂SO₄) or iron(III) dichromate (Fe₂(Cr₂O₇)₃) requires understanding chemical formulas. For instance, (NH₄)₂SO₄ contains 2 nitrogen, 8 hydrogen, 1 sulfur, and 4 oxygen atoms, totaling 15 atoms. Naming compounds follows rules based on element symbols, oxidation states, and polyatomic ions.

For example, the formula for rubidium hydrogen phosphate is RbHPO₄, indicating the combination of rubidium (Rb+), hydrogen (H+), and phosphate (PO₄³−). Similarly, calcium chloride is CaCl₂, with calcium (Ca²⁺) and chloride ions. Accurate formulas help in understanding compound composition and predicting reactions.

Conclusion

Mastery of the periodic table's structure, elements’ classification, atomic structure, and chemical nomenclature is essential for understanding chemical behavior and reactions. Recognizing elemental categories guides predictions about reactivity, while understanding molecular formulas and nomenclature ensures precise communication in chemistry. Continual study and application of these principles underpin advances in chemical research and education, supporting a comprehensive understanding of matter at the atomic and molecular levels.

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