Biochemistry (Unit 2)

What is the dense area in the center of an atom?

• orbital

• nucleus

• valence electron

• proton

What 2 subatomic particles are found in the nucleus?

• protons and electrons

• protons and neutrons

• neutrons and electrons

• valence electrons

Which 2 subatomic particles make up the mass of an atom?

• protons and neutrons

• protons and electrons

• protons only

• neutrons and electrons

Which 2 subatomic particles give an atom its charge?

• protons and neutrons

• protons only

• protons and electrons

• neutrons and electrons

What is the mass of this atom?

• 3

• 4

• 7

• 10

What is the charge of this atom?

• 0

• +3

• -3

• 7

What element is pictured here?

• boron

• fluorine

• magnesium

• beryllium

What are the outermost electrons called and why are they important?

• valence electrons, they determine bonding

• valence electrons, they are the only electrons that determine charge

• protons, they determine charge

What charge do protons, neutrons, and electrons have respectively?

• • + neutral -

• • + - neutral

• • - + neutral

• • - neutral +

     What type of bond forms between nonmetals when electrons are evenly distributed due to similar electronegativity?

• ionic

• polar covalent

• nonpolar covalent

• metallic