Year 9 Chemistry

What are the positive particles of an atom?

• Neutrons

• Electrons

• Protons

• Nuclei

What is the charge of a neutron?

• Positive charge

• Negative charge

• No charge; they are neutral particles.

• Variable charge depending on the environment

How many neutrons does this atom have?

• 10

• 11

• 12

• 13

What is the nucleus of an atom?

• The outer shell of an atom that contains electrons.

• The central part of an atom, containing protons and neutrons.

• A type of particle that orbits the nucleus.

• The energy level of an atom.

What happens when an atom gains a valence electron?

• It becomes a positive ion.

• It becomes a negative ion.

• It remains neutral.

• It loses a proton.

What is a valence electron?

• Electrons that are found in the nucleus of an atom.

• Electrons that are involved in chemical bonding and are in the outermost shell of an atom.

• Electrons that are always positively charged.

• Electrons that are responsible for the mass of an atom.

What is an ion?

• An atom or molecule that has lost or gained an electron (giving it a + or - charge)

• A neutral atom with no charge

• A particle that is always positively charged

• A molecule that cannot gain or lose electrons

Number of electrons in each shell

• 2, 8, 8, 2

• 2, 8, 8, 8

• 2, 4, 8, 2

• 2, 8, 6, 2

What are electrons?

• Negatively charged particles that orbit the nucleus of an atom.

• Positively charged particles found in the nucleus of an atom.

• Neutral particles that exist in the electron cloud of an atom.

• Particles that are responsible for the mass of an atom.

A stable electron configuration means ...

• the outer shell is full

• the inner shell is empty

• the atom has no electrons

• the atom is positively charged