Periodic Table of Elements

Question 1

What is periodic table?

Answer 1

Tabular arrangement of the chemical elements organized on the basis of their atomic numbers, electron configurations and recurring chemical properties. Elements are presented in order of increasing atomic number (the number of protons in a nucleus)

Question 2

What is a group?

Answer 2

Vertical columns on the periodic table (they are 18 in total) Elements in the same group have the same characteristics.

Question 3

What is a period?

Answer 3

Horizontal rows of the periodic table (7 in total). Elements in the same period do not have the same properties.

Question 4

What are valence electrons?

Answer 4

Electrons farthest away from the nucleus of an atom involved in the formation of chemical bonds. Can range from 1-8

Question 5

How many valence electrons are in Group 15

Answer 5

5 valence electrons