Unit 1 Atoms & Periodic Table REVIEW

An atom consists of 33 protons, 42 neutrons, and a number of electrons. Which information will be MOST helpful in determining the atom's identity?

• number of electrons

• number of neutrons

• number of protons

• the period number

What element has the atomic number of 3?

• Lithium

• Sodium

• Beryllium

• Titanium

Why are noble gases the least reactive elements on the periodic table?

• they are gases

• they have the same number of protons

• the have full energy levels/shells

• they have the same atomic mass

Carbon is a ___________ with an atomic number of ___________.

• metal, 12

• noble gas, 6

• non-metal, 6

• metalloid, 12

Where are the most reactive elements located on the periodic table?

• left side

• right side

• on the zig-zag line

• at the very bottom

If two elements have the atomic mass of 14 and element A has 6 electrons and element B has 7 electrons, how can they have the same atomic mass?

• element B has one more neutron than element A

• element A & B are the same element

• element A has one more neutron than element B

An electrically neutral atom contains 12 neutrons, 17 electrons and a certain number of protons. What is the atomic mass of this element?

• 25

• 29

• 12

• 17

Tags

NGSS.MS-PS1-1

Ernest Rutherford, who conducted the Gold Foil Experiment, suggested that atoms are made up of ___________ because particles passed straight through the foil without many being deflected. He discovered small, dense positively charged particles present in the nucleus called protons.

• only neutrons

• many layers of subatomic particles

• mainly empty space

Electron placement determines the reactivity of the atom.

• True

• False

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which subatomic particle determines the identity of the atom?

• proton

• neutron

• electron

• valence electron