Atom Structure

Question 1

Mass Number

Answer 1

1. Number of protons + number of neurtons in nucleus.

Question 2

Atomic Number

Answer 2

1. Number of protons in the nucleus of an atom

2. Table of Elements is arranged by protons of elements. (thus important)

Question 3

Structure of an Atom

Answer 3

1. Protons and neurtons reside in nucleus

2. Electrons around the nucleus. They are attracted to the nucleus so they won’t go away.

Question 4

Isotopes

Answer 4

1. They are different versions of the same element - or the same atomic number.
2. They have a different mass number thus the difference lies on the number of neutrons.