Atomic Structure

Question 1

what are isotopes?

Answer 1

isotopes are atoms of the same element with the same number of protons and electrons but different number of neutrons and masses

Question 2

what is the relative atomic mass?

Answer 2

the weighted mean mass of an atom compared with 1/12th mass of carbon-12

Question 3

what does the number of peaks in a mass spectra represent?

Answer 3

the number of isotopes

Question 4

what is the relative mass of a proton?

Answer 4

1

Question 5

what is the relative charge of a proton?

Answer 5

+1

Question 6

what is the relative mass of a neutron?

Answer 6

1

Question 7

what is the relative charge of a neutron?

Answer 7

0

Question 8

what is the relative mass of an electron?

Answer 8

1/1835

Question 9

what is the relative charge of an electron?

Answer 9

-1

Question 10

which force is stronger; nuclear force or electrostatic force?

Answer 10

nuclear force

Question 11

what is the name of the force holding protons and neutrons in the nucleus?

Answer 11

• strong nuclear force

Question 12

what is the name of the force holding electrons and protons?

Answer 12

• electrostatic force of attraction

Question 13

what are the features of a nuclear force?

Answer 13

• can withstand repulsion between protons and neutrons
• acts over short distances within nucleus

Question 14

what is the relative isotopic mass?

Answer 14

• mass of an isotope compared with 1/12th mass of carbon-12

Question 15

what is relative atomic mass?

Answer 15

• the weighted mean mass of an atom compared with 1/12th mass of carbon-12

Question 16

what are differences between isotopes of the same element?

Answer 16

• different physical properties
• different number of neutrons
• different mass numbers