The Nucleus

What is all matter made up of?

• Cells

• Atoms

• Electrons

• Life

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Different elements are made up of different types of atoms.

• True

• False

Tags

NGSS.MS-PS1-1

All known elements are represented on the ________ _______ of Elements

An element is defined by the number of ​ (a)   that it has.

• protons
• neutrons
• electrons

Label the different pieces of information provided by the Periodic Table.

a

b

c

d

Atomic number

Element symbol

Element name

Mass number

Tags

NGSS.MS-PS1-1

Match the following elements to their symbols.

Use your periodic table!

• Al

• Aluminium

• Hg

• Hydrogen

• Na

• Mercury

• H

• Sodium

• Au

• Gold

The atomic number tells us how many ________an atom has.

For example, Magnesium is atomic number 12 so it has 12 ________.

• Electrons

• Neutrons

• Protons

• Atoms

What does the mass number tell us?

• The number of protons+electrons

• The number of protons+neutrons

• The number of electrons+neutrons

• The number of particles

Atomic number = protons

Mass number = protons + neutrons

Therefore: Number of neutrons = ​ (a)   - ​ (b)  

• mass number
• atomic number
• protons
• neutrons

In a neutral atom, there will be the same number of (positive) protons and (negative) electrons.

Oxygen has 8 protons so it will have ___ electrons

• 8

• not 8

Tags

NGSS.MS-PS1-1