Quiz on isotopes/ nuclear reactions

Question 1

what is indicated from an atomic number?

Answer 1

-number of protons and electrons

Question 2

what is indicated from a mass number?

Answer 2

number of protons and neutrons

Question 3

what is atomic mass?

Answer 3

• weighted average mass of atoms naturally occurring that sample of the element
• reflects both mass and relative abundance of isotopes
• whole number = does not naturally occur in nature

Question 4

define isotopes

Answer 4

• atoms that have the same number of protons but different number of neutrons
• have different mass numbers

Question 5

what does each part of the following equation mean?

a/z C

Answer 5

a= protons/neutrons or atomic mass
z= protons
C= element name

Question 6

define protons

Answer 6

determine the identity of an element (drivers license)

Question 7

define neutrons

Answer 7

hold the nucleus together and influence mass

Question 8

define electrons

Answer 8

determine the chemical properties of an element (who you are)

Question 9

what is contained in the nucleus

Answer 9

protons/ neutrons

Question 10

density level of nucleus of an atom?

Answer 10

VERY heavy. Holy MOLY

Question 11

state the two kinds of isotopes and define them

Answer 11

stable: nucleus stays in tact
unstable: nucleus decays and emits radiation

Question 12

define fission and fusion, also what they are responsible for

Answer 12

Fission: when the atom divides into smaller parts (fission is division) responsible for nuclear energy and bombs
Fusion: when 2+ atoms fuse together to become one, responsible for stars and new elements

Question 13

name the 3 types of decay and define them

Answer 13

alpha: nucleus ejects 2 protons and neutrons simultaneously (atomic number goes down 2, atomic weight goes down 4)
beta: neutron splits into proton and electron (atomic number goes up 1)
gamma: no change, just emits radiation (deadly)