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Flashcards in Atomic Structure Deck (11):
1

What do we know from Rutherford's scattering investigations?

Every atom contains:
• A positively charged nucleus composed of protons and neutrons.
• Electrons that surround the nucleus.

2

What are nucleons?

Total number of protons and neutrons in an atom.

3

How are electrons held in the atom?

Electrons are held in the atom by the electrostatic force of attraction between them and the nucleus.

4

How do the masses compare between the nucleons and the electrons?

• Electron has a much smaller mass than the proton or the neutron.
• Proton and the neutron have an almost equal mass.
• Electron has equal and opposite charge to the proton, a neutron is uncharged.

5

What is the relative mass of a proton?

1

6

What is the relative mass of a neutron?

1

7

What is the relative mass of an electron?

0.0005

8

What is the proton number?

The proton number is also known as the atomic number.

9

What are isotopes?

Atoms with the same number of protons and different number of neutrons.

10

What is a nuclide?

Type of nucleus.

11

What is the specific charge defined as?

Specific charge of a charged particle is defined as its charge divided by it's mass.
Charge/Mass.