Science Review One

Which statement correctly describes the location and charge of protons in an atom?

• The protons are located in the electron cloud and have a negative charge.

• The protons are located in the nucleus and have no charge.

• The protons are located in the nucleus and have a negative charge.

• The protons are located in the nucleus and have a positive charge.

What is the total number of protons, neutrons, and electrons in an atom of Sodium with the mass number of 23?

• 23

• 11

• 34

• 45

An atom of a certain element has 36 protons, 36 electrons, and the mass number of 84. How many neutrons are in this atom?

• 72

• 36

• 120

• 48

What is the mass number of a Sodium atom that has 12 neutrons?

• 23

• 11

• 35

• 24

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton.

• It has negative charge and much less mass than a proton.

• It has positive charge and much more mass than a neutron.

• It has negative charge and about the same mass as a neutron.

An atom has 8 protons, 8 neutrons, and 8 electrons. What is the charge of the atom's nucleus?

• +8

• -8

• +16

• +34

What determines the element's identity?

• Nucleus

• Electrons

• Protons

• Neutrons

Where are the valence electrons located and what do they determine.

• Valence electrons are located in the electron cloud and they determine the element's identity.

• Valence electrons are located in the nucleus and they determine the element's chemical properties including reactivity.

• Valence electrons are located in the last energy level and they determine the element's chemical properties including reactivity

• Valence electrons are located in the last energy level and they determine the element's identity.

What 4 groups are the most reactive on the Periodic Table.

• Groups 1,2,3 and 4

• Groups 1,2,17 and 18

• Groups 15,16,17 and 18

• Groups 1,2,16 and 17

Describe the elements in group 18.

• Very reactive and stable nonmetals

• Not reactive and stable gasses

• Very reactive and stable metals

• Not reactive and stable metalloids