End of module 3 Review Packet

Front

What did Rutherford discover in his experiment?

Back

Rutherford discovered the nucleus of the atom, which is a dense positively charged center.

Front

How many neutrons are in Magnesium?

Back

Magnesium has 12 neutrons.

Front

An alpha particle is made up of?

Back

An alpha particle is made up of 2 protons and 2 neutrons.

Front

What is the average atomic mass of an element with the following isotopes: 4.35% have a mass of 49.9461 amu, 83.79% have a mass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389 amu?

Back

The average atomic mass is 51.99 amu.

Front

What did Rutherford discover about atoms?

Back

Rutherford discovered that an atom is mostly empty space, but has a dense positively charged center (nucleus).

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the significance of the nucleus in an atom?

Back

The nucleus contains protons and neutrons and is responsible for the atom's mass and positive charge.

Front

How do you calculate the average atomic mass of an element?

Back

Average atomic mass is calculated by multiplying the mass of each isotope by its relative abundance and summing the results.