Atoms with the same number of protons but different numbers of neutrons are called __________. 

Which statement is incorrect about the atomic number of an atom?

A) It equals the number of protons in its nucleus.

B) It equals the number of electrons outside the nucleus.

C) It equals the sum of its protons and neutrons..

D) It is a whole number.

E) It is given on the Periodic Table

Which of the following describes a hydride ion?

A) a negatively charged hydrogen ion containing a pair of electrons

B) a positively charged hydrogen ion

C) a hydrogen ion containing a single electron

D) a negatively charged OH ion

E) a proton containing an extra electron

Rank the following atoms in increasing electronegativity.

A) N, Na, Si, O, C

B) C, N, O, Na,  Si

C) O, N, C, Si, Na

D) Si, C, N, O, Na

E) Na, Si, C, N, O

Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond accounts for this fact?

The compound methylamine, H3C-NH2, contains a C-N bond. In this bond, which of the following best describes the charge on the nitrogen atom?

A) +1

B) slightly positive

C) uncharged

D) slightly negative

E) -1

Which of the compounds below bond predominantly via ionic bonding?

A) KCl

B) CF4

C) NH3

D) both A and B

E) both B and C

Which of the following contains polar covalent bonds?

A) NH3

B) Na2O

C) H2

D) KF

E) both A and C

What is the name given for a species that contains a positively charged carbon atom?

A) carbanion

B) carbocation

C) methyl radical

D) carbon radical

E) free radical