Question

For elements 1-20, we can use the periodic table to predict.

A) An elements color
B) The number of valence electrons an element has
C) The number of isotopes an element has.

Answer 1

B.

Step-by-step explanation:

We can predict the number of valence electrons by which group of the Periodic table an element resides.

For example Lithium is in group 1 and has 1 valency electron.

Answer 2

B

Step-by-step explanation:

because a periodic table shows the arrangement of element according to their atomic number and their valence neither

isotopes nor colour