Periodic Table of Elements

Question 1

How are elements arranged on the Periodic Table?

Answer 1

In increasing order of the atomic number (number or protons in the nucleus)

Question 2

Columns

Answer 2

~called groups

~all elements in a group have the same number of valence electrons

Question 3

Rows

Answer 3

~called periods
~when moving left to right, the number of valence electrons increase
~when moving down the rows, the number of electron shells increase