Question

1. what is at the center of every atom?

a. an electron
b. a compound
c. a molecule
d. a nucleus

1. which two particles make up the nucleus of an atom?

a. protons and electrons
b. protons and neutrons
c. protons and compounds
d. neutrons and electrons

1. which is the role of an electron in an atom?

a. electrons live inside the nucleus and carry a neutral charge
b. electrons circling the nucleus and have a positive charge
c. electrons circle the nucleus and have a negative charge
d. electrons live inside the nucleus and have a negative charge

1. in an atom, what is the number of protons equal to?

a. the number of electrons
b. the number of protons
c. the number of molecules
d. the number of neutrons

1. which of the following determines the type of element that an atom makes?

a. the size of the nucleus
b. the number of protons
c. how much the atom weighs
d. the number of neutrons

1. what forms when two atoms combine?

a. a molecule
b. a nucleus
c. a proton
d. an electron

1. what is a compound?

a. the center of an atom
b. a tiny particle that makes up all matter
c. a molecule that is formed from two or more different types of atoms
d. a molecule that is formed from the same type of atom

Explanation:

1. The center of an atom is the nucleus.
2. Nucleus contains protons and neutrons.
3. Electrons orbit nucleus with negative charge.
4. Neutral atom has equal protons and electrons.
5. Element type is determined by proton number.
6. Two atoms combine to form a molecule.
7. Compound: molecule with different atom types.

Answer:

1. d. A nucleus
2. b. Protons and neutrons
3. c. Electrons circle the nucleus and have a negative charge
4. a. The number of electrons
5. b. The number of protons
6. a. A molecule
7. c. A molecule that is formed from two or more different types of atoms