Atomic Structure and Isotopes

Protons and neutrons are in the ________.

• nucleus

• electron cloud

• valence shell

• orbit

Which subatomic particle orbits the nucleus in energy levels?

• Electron

• Proton

• Neutron

• Positron

What is the charge and mass of a neutron?

• No charge (0), mass = 1

• Positive charge (+1), mass = 1

• Negative charge (-1), mass = 0.5

• No charge (0), mass = 0

What is the charge and mass of an electron ?

• No charge (0), mass = 1

• Positive charge (+1), mass = 1

• Negative charge (-1), mass = nearly 0

• No charge (0), mass = 0

What is the charge and mass of a proton?

• Negative charge (–1), very small mass (approx. 0)

• Positive charge (+1), mass 1

• Neutral charge (0), very large mass

• Positive charge (+1), very small mass (approx. 0)

A labelled inside the nucleus is a ________ or ________.

• proton or neutron

• electron or positron

• photon or gluon

• quark or lepton

Which particle has the lowest mass?

• Electron

• Proton

• Neutron

• Alpha particle

Atomic number is equal to the number of ________ or ________.

• protons or electrons

• neutrons or protons

• electrons or neutrons

• protons or neutrons

Mass number is equal to ________ + ________.

• protons + neutrons

• protons + electrons

• neutrons + electrons

• electrons + positrons

The group number in the periodic table tells you how many ________ are in the outer shell.

• electrons

• protons

• neutrons

• atoms