6 - Unit 1, Section 1 - Day 3

Matter: How The World Is Built

Unit 1, Section 1

Match

Match each subatomic particle to its correct description.

• Proton

• Neutron

• Electron

Positive, Relative Large, In The Nucleus

Neutral, Relatively Large, In The Nucleus

Negative, Relatively Small, Orbits The Nucleus

• Positive, Relative Large, In The Nucleus

• Neutral, Relatively Large, In The Nucleus

• Negative, Relatively Small, Orbits The Nucleus

• Atomic Number - the number of protons in the nucleus of an atom

• It defines the element

• You can use the periodic table to find the atomic number of any element

  • It's on the top (or top-left) of the box

Atomic Number

Multiple Choice

What is the atomic number of chlorine (Cl)?

• 7

• 12

• 17

• 22

Multiple Choice

What is the atomic number of molybdenum (Mo)?

• 32

• 37

• 42

• 47

Multiple Choice

How many protons are in the nucleus of a molybdenum (Mo) atom?

• 32

• 37

• 42

• 47

Mass Number - the number of protons plus the number of neutrons in an atom
You can't find this on the periodic table
You'll have to do some math

Mass Number