Calculating Subatomic Particles

What does the atomic number of an element represent?

Groups:

(a) Atomic Number

,

(b) Atomic Mass

,

(c) Mass Number

• Number of protons

• The protons + neutrons of a specific isotope of an atom

• The average protons + neutrons of ALL isotopes of an atom

Click on the atomic number

Click on the element symbol

Click on the atomic mass

What is the most common MASS NUMBER for lithium

Uranium has ​ (a)   protons and 92 electrons. It also has an atomic mass of ​ (b)   while its most common mass number is ​ (c)   . Doing some basic atomic math you can figure out that Uranium has ​ (d)   neutrons.

• 92
• 238.03
• 238
• 146
• 90
• 235.5
• 235
• 143
• 94

How do you find the mass number of an element?

• By counting the number of isotopes

• By subtracting the atomic number from the atomic mass

• By rounding the atomic mass to the nearest whole number

• By adding the number of protons and electrons

If an element has 8 protons, how many electrons does it have in its neutral state?

• 4

• 8

• 12

• 16

For zinc (atomic number 30), what is the mass number when the atomic mass is 65.39?

• 65

• 30

• 35

• 95

Element number three has an atomic mass of 6.941. What is the number of neutrons?

• 7

• 4

• 3

• 10