1.1- INSIDE THE ATOM

Question 1

What two things does every atom contain that was shown by Rutherford’s alpha-scattering investigations?

Answer 1

positively charged nucleus composed of protons and neutrons

electrons that surround the nucleus

Question 2

What word is used for a proton or a neutron in the nucleus?

Answer 2

nucleon

Question 3

How are electrons held in the atom?

Answer 3

electrostatic force of attraction between them and the nucleus (opposite charge)

Question 4

What is known about every atom of a given element?

Answer 4

it has the same number of protons as any other atom of the same element

Question 5

What is an isotope?

Answer 5

Atoms of the same element with different numbers of neutrons but equal number of protons

Question 6

What is the nucleon number/mass number?

Answer 6

total number of protons and neutrons in an atom

Question 7

Why is the name of the total number of protons and neutrons in an atom called the mass number?

Answer 7

it is almost numerically equal to the mass of the atom is relative units (where the mass of a proton or neuron is approximately 1)

Question 8

What is a nucleon?

Answer 8

neutron or a proton in the nucleus

Question 9

What is the specific charge of a charged particle defined as?

Answer 9

its charge divided by its mass