Chemistry Y9

How many electrons can the first energy shell/level hold?

• 1
• 2
• 8
• 0

What charge do electrons have?

• Positive

• Neutral

• Negative

Which two particles are contained in the nucleus of an atom?

• Protons and Neutrons

• Protons and Electrons

• Electrons and Neutrons

How many energy shells/levels does this atom have?

• 1

• 2

• 3

• 4

How many neutrons does a sodium atom have? (Use the image to help you)

• 23
• 11
• 12
• 34

The electronic structure of ₁₇Cl is

• 2,8,8,1

• 2,8,6

• 2,8,8

• 2,8,7

Which of the following is the electronic structure of Sodium ₁₁Na

• 2,8

• 2,8,1

• 2,1,8

• 8,1,2

Atoms of elements in group 1 have

• one electron in its outermost orbit

• two electrons in its outermost orbit

• three electrons in its outermost orbit

• four electrons in its outermost orbit

Write the symbol for Chlorine

• Cl
• C
• Co
• Cr

Which element has 2,8,8 electrons per shell?

• Lead

• Fluorine

• Neon

• Argon