Question

review:

1. chemical properties
2. neutron
3. proton
4. physical properties
5. electron
6. the weighted average of the atomic masses of an elements naturally - occurring isotopes is called the

a. average atomic number.
b. average atomic mass.
c. average atomic unit.
d. average mass number.

1. what atom has a different number of neutrons than other atoms of the same element?

a. ion
b. electron
c. isotope
d. molecule

1. what are counted in an atom to determine mass number?

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

1. what is the atomic number of an element?

a. the number of protons and neutrons
b. the number of valence electrons
c. the number of neutrons
d. the number of protons

1. elements are arranged on the periodic table

a. in order of molecular numbers.
b. in order of atomic numbers.
c. alphabetically.
d. randomly.
a. negatively charged subatomic particle
b. characteristics that describe how a substance reacts with other substances to form new substances
c. characteristics that can be observed without changing the composition of the substance
d. subatomic particle without charge
e. positively charged subatomic particle

Explanation:

1. Chemical properties describe how a substance reacts with others to form new substances.
2. A neutron is a subatomic particle without charge.
3. A proton is a positively - charged subatomic particle.
4. Physical properties can be observed without changing the composition of the substance.
5. An electron is a negatively - charged subatomic particle.
6. The weighted average of an element's naturally occurring isotopes' atomic masses is the average atomic mass.
7. An isotope has a different number of neutrons than other atoms of the same element.
8. Protons and neutrons are counted to determine the mass number.
9. The atomic number of an element is the number of protons.
10. Elements are arranged on the periodic table in order of atomic numbers.

Answer:

1. b
2. d
3. e
4. c
5. a
6. b
7. c
8. b
9. d
10. b