Section 2.4- Atomic Number, Mass Number, Isotopes, and Ions

Question 1

the _____________________ in the nucleus determines the identity of an element

Answer 1

number of protons and electrons

Question 2

the number of protons in the nucleus is the atom’s

Answer 2

atomic number

Question 3

all atoms of the same element have the same number of ______________ and hence the same atomic number, Z

Answer 3

protons

Question 4

the sum of the number of protons and the number of neutrons in a nucleus

Answer 4

mass number

Question 5

symbol for mass number

Answer 5

A

Question 6

atomic number for protons

Answer 6

Z

Question 7

atomic number for neutrons

Answer 7

N

Question 8

nuclear particles, whether neutrons or protons, are known collectively as

Answer 8

nucleons

Question 9

mass number formula

Answer 9

A= Z + N

Question 10

the mass number is not a __________

Answer 10

mass

Question 11

atoms of the same elements that differ in their mass numbers are

Answer 11

isotopes

Question 11

if an atom contains as many electrons as protons, the negative and positive charges balance and the atom is

Answer 11

electrically neutral

Question 12

characteristic of an atom that determines its identity as a particular element

Answer 12

number of protons

Question 13

term for an atom or molecule that has an unequal number of electrons and protons, resulting in a charge

imbalance of electrons to protons

Answer 13

ions

Question 14

an ion with more electrons than protons has an excess of negative charge; it is thus negatively charged and is an

Answer 14

anion

Question 15

a positively charged ion

Answer 15

cation

Question 16

in neutral atoms, there are equal numbers of

Answer 16

electrons and protons