2.1 Quiz Review

A difference in the number of neutrons in an atom denotes _____________ while a different number of protons denotes _________.

• different elements; different isotopes

• different elements; different orbitals

• different isotopes; different elements

• different orbitals; different shells

When do compounds form?

• If the nuclei of those elements are unstable

• If the valence orbital isn't full

• If one of the elements is negatively charged and one is positively charged

• If one of the atomic masses is high and one is low

Which of the following particles is the smallest?

• Proton

• Neutron

• Electron

Which of the following is NOT one of the six elements that comprise 99% of biotic systems?

• Carbon

• Calcium

• Oxygen

• Helium

How many electrons can be held in the third shell (maximum)?

• 8

• 6

• 4

• 2

Which atom would be most likely to gain electrons? (all answers are assumed to be valence electrons)

• An atom with 7 electrons in the third shell

• An atom with 1 electron in the third shell

• An atom with 1 electron in the fourth shell

• An atom with 7 electrons in the second shell

Which atom is most likely to become a positively charged ion?

• An atom with 7 of 8 valence electrons

• An atom with 1 of 8 valence electrons

• An atom with 8 of 8 valence electrons

• An atom with 4 of 8 valence electrons

What kind of bonds form between hydrogen and oxygen in water?

• Ionic

• Covalent

• Hydrogen

If carbon's atomic number is 6, how many neutrons does carbon-14 have?

• 6

• 8

• 14

How many valence electrons does an oxygen atom have?

• 2

• 4

• 6

• 8