Periodic Table

Question 1

The periodic table is a chart of all known chemical __________.

Answer 1

elements

Question 2

Elements are arranged by increasing __________ number, which is the number of protons.

Protons are tiny positively charged particles found in the center (nucleus) of an atom.

Answer 2

atomic

Question 3

The periodic table helps scientists predict how elements will _________.

Answer 3

react