Year 9 Semester Quiz preparation

Wher is the majority of the mass of an atom located?

• In the electron shells

• In the Nucleus

• In the nucleus and electron shells

What is the charge of electrons?

• Positive

• Negative

• Neutral

• Variable

How do electrons fill the orbitals?

• Randomly

• From higher energy to lower energy orbitals

• From lower energy to higher energy orbitals

• In no specific order

What is the octet rule?

• Atoms have 8 protons in the nucleus

• Atoms have 8 neutrons in the nucleus

• Atoms have 8 electrons in the outer shell

• Atoms have 8 electrons in the nucleus

What do atoms tend to do to achieve stability?

• Lose protons

• Gain protons

• Lose electrons

• Gain electrons

What is the maximum number of electrons in a full outer shell?

• 2

• 4

• 6

• 8

What is the purpose of gaining or losing electrons?

• To increase the mass of the atom

• To decrease the mass of the atom

• To achieve a full outer shell and stability

• To change the charge of the nucleus

Carbon has 6 protons. Carbon has an atomic mass of 12. How many neutrons does Carbon have?

• 12
• 0
• 2
• 6

Fluorine has an atomic number of 9. How many protons does it have?

• 4
• 9
• 12
• 0

Calcium has an atomic mass of 40 amu. Calcium has 20 protons. How many neutrons does Calcium have?

• 40
• 20
• 0
• 15