Question

. atomic weight

one of two or more atoms of the same element with different masses due to different numbers of neutrons
2. isotope
a horizontal row on the periodic table
3. period
something that repeats itself on a regular, predictable basis
4. periodic
the average relative mass of each element

Answer 1

1. atomic weight

the average relative mass of each element

2. isotope

one or two or more atoms of the same element with different masses due to different numbers of neutrons

3. period

a horizontal row on the periodic table

4. periodic

something that repeats itself on a regular, predictable basis

Answer 2

1. atomic weight - the average relative mass of each element

2. isotope - one of two or more atoms of the same element with different masses due to different numbers of neutrons

3. period - a horizontal row on the periodic table

4. periodic - something that repeats itself on a regular, predictable basis

Step-by-step explanation:

4. periodic - something that repeats itself on a regular, predictable basis

2. isotope - one of two or more atoms of the same element with different masses due to different numbers of neutrons

3. period - a horizontal row on the periodic table

1. atomic weight - the average relative mass of each element