Isotopes

Question 1

Which of the following are always the SAME for atoms of the same element?

a) mass number
b) atomic number
c) neutron number
d) mass of an atom

Answer 1

b) atomic number

Question 1

Define: Isotope

Answer 1

Element has the same number of protons, but different number of neutrons

Question 2

Which of the following are DIFFERENT for isotopes of an element?

a) mass number
b) atomic number
c) neutron number
d) mass of an atom

Answer 2

a) mass number
c) neutron number
d) mass of an atom

Question 3

Determine the atomic #, mass #, # of protons, # of neutrons, and # of electrons in these isotopes

92 uranium-235

92 uranimum-238

Answer 3

92 uranium-235

Atomic Number: 92
Mass number: 235
Number of Protons: 92
Number of Neutrons: 143 (mass - #p = #n)
Number of Electrons: 92

92 uranium-238

Atomic Number: 92
Mass number: 238
Number of Protons: 92
Number of Neutrons: 146 (mass - #p = #n)
Number of Electrons: 92

Question 4

What is the format when writing out isotopes/elements

Answer 4

Atomic mass at the top left

Atomic symbol in the middle

Atomic number at the bottom left

Question 5

Write out the isotpe of Carbon-12

Answer 5

12 = mass
C = atomic symbol
6 = atomic number

refer to answer on chemistry notes

Question 6

Carbon-13

What does the number that is bolded tell you about Carbon?

Answer 6

atomic mass

Question 7

I have Phosphorus-26, how many protons, neutrons, and electrons are there?

Answer 7

Protons: 15
Neutrons: 11 (26 -15 = 11)
Electrons: 15

Question 8

Complete worksheet given in class and do the Isotope practice on goodnotes