CH 9 – Understanding the Atom Review

The atomic number of an element represents:

• The number of neutrons

• The number of protons

• The total number of electrons and protons

• The mass number

An atom that has lost electrons becomes:

• A cation

• An anion

• Neutral

• An isotope

Which scientist is given credit for discovering that the positive charges are located in the center of the atom?

• Rutherford

• Thomson

• Chadwick

• Dalton

The electron was discovered by

• Rutherford

• Thomson

• Chadwick

• Dalton

Using the nuclear symbol, what does the number 16 represent?

• average atomic mass.

• atomic number.

• number of neutrons.

• None of the above

Tags

NGSS.MS-PS1-1

Using the nuclear symbol, calculate how many neutrons the atom of Sulfur has.

• a. 17

• b. 16

• c. 33

• d. 18

Tags

NGSS.MS-PS1-1

What is the charge of a proton?

• -1

• 0

• +1

• +2

Which of the following particles is normally found outside the nucleus of the atom?

• electron

• proton

• neutron

• alpha particle

An atom becomes a cation when it:

• Gains electrons

• Loses protons

• Loses electrons

• Gains neutrons

The symbol of an electron is

• a. e⁰

• b. e²⁻

• c. e⁰

• d. e⁻