Question

1. which of these is a metal?

a) oxygen
b) iron
c) neon
d) chlorine

1. which of these is a nonmetal?

a) gold
b) copper
c) nitrogen
d) sodium

1. what does the chemical symbol \o\ stand for?

a) oxygen
b) osmium
c) ozone
d) oxide
10.
a\ is the symbol for:
a) neon
b) sodium
c) nitrogen
d) nickel

1. \au\ is the symbol for:

a) silver
b) gold
c) aluminum
d) argon

1. the atomic number tells you:

a) the number of neutrons
b) the number of protons
c) the number of electrons only
d) both protons and neutrons

1. which part of the atom moves around the nucleus?

a) protons
b) neutrons
c) electrons
d) atoms

1. which subatomic particle has a positive charge?

a) electron
b) proton
c) neutron
d) ion

1. what does the atomic mass tell you?

a) protons + neutrons
b) only protons
c) only electrons
d) protons + electrons

1. what does the periodic law state?

Explanation:

• Question 7: Iron is a metal. Metals are typically good conductors of heat and electricity, have a shiny luster, and are malleable and ductile. Oxygen is a non - metal gas, neon is a noble gas (non - metal), and chlorine is a non - metal gas.
• Question 8: Nitrogen is a non - metal. Gold and copper are metals, and sodium is a metal. Non - metals generally have different properties than metals, such as being poor conductors (in solid form, for non - metal solids) and having different chemical reactivities.
• Question 9: The chemical symbol “O” stands for oxygen. Osmium has the symbol “Os”, ozone is \(O_3\) (a molecule, not an element symbol in the same sense), and oxide is a compound (e.g., \(CO_2\) has an oxide part, but it's not the symbol for an element).
• Question 10: “Na” is the symbol for sodium. Neon is “Ne”, nitrogen is “N”, and nickel is “Ni”.
• Question 11: “Au” is the symbol for gold. Silver is “Ag”, aluminum is “Al”, and argon is “Ar”.
• Question 12: The atomic number tells you the number of protons. In a neutral atom, the number of electrons is equal to the number of protons, but the atomic number specifically refers to protons. Neutrons are not directly given by the atomic number (atomic mass - atomic number = number of neutrons in a neutral atom).
• Question 13: Electrons move around the nucleus. Protons and neutrons are in the nucleus. Atoms are the whole entity, not a sub - atomic particle that moves around the nucleus.
• Question 14: Proton has a positive charge. Electron has a negative charge, neutron has no charge, and ion is an atom that has gained or lost electrons (not a sub - atomic particle with a positive charge in the basic sense).
• Question 15: The atomic mass tells you protons + neutrons. Protons and electrons have very different masses (electrons have a negligible mass compared to protons and neutrons in terms of atomic mass calculation).

Answer:

1. B. Iron
2. C. Nitrogen
3. A. Oxygen
4. B. Sodium
5. B. Gold
6. B. The number of protons
7. C. Electrons
8. B. Proton
9. A. Protons + Neutrons