SQ AT WT COE0005

# of proton + # of neutron

• atomic mass

• mass number

• atomic number

• Z

CHOOSE ALL CORRECT ANSWERS

mass number - # of neutron

• # of proton

• atomic number

• atomic mass

• # of electrons

branch of chemistry which studies carbon-containing compounds

• analytical chemistry

• inorganic chemistry

• organic chemistry

• physical chemistry

in determining the average atomic mass of an element, abundance and mass of naturally occurring isotopes are considered

• TRUE

• FALSE

SI unit for volume

• cc

• cubic meter

• Liter

• mL

If the charge of X ion is +3 and atomic number is 13, the number of electrons is:

• 13

• 16

• 10

Complete the following for an UNCHARGED ATOM OF AN ELEMENT

Proton = 14

Neutron = 16

• atomic number: 14

  mass number: 30

• atomic number: 16

  mass number: 30

• atomic number: 14

  mass number: 16

• atomic number: 16

  mass number: 14

Which of the following is correct if the charge is +2 and

proton: 38

mass number: 88

• atomic number: 36

  neutron: 50

• atomic number: 38

  neutron: 50

• atomic mass: 38

  neutron: 50

• atomic mass: 36

  neutron: 50

Determine the average atomic weight of silicon if:

92.21% of samples have a mass of 27.977 u,

4.70% have a mass of 28.976 u, and

3.09 % have a mass of 29.974 u.

(Express with 4 decimal places)

• 28.0857

• 28.0855

• 28.0856

Strontium consists of four isotopes with masses of

84 u (abundance 0.50%),

86 u (abundance of 9.9%),

87 u (abundance of 7.0%), and

88 u (abundance of 82.6%).

Calculate the average atomic mass of strontium.

• 87.4

• 87.5

• 87.6

• 87.7