Periodic Table

Discovered the existence of electrons using a cathode ray tube.

Oxygen has this many valence electrons:

Which one of the following alkali metals is the MOST reactive?

The periodic group which needs one more valence electron to complete its outer energy level.

The periodic table group that has a full amount of electrons in its outermost energy level:

The two most reactive groups on the periodic table are the:

The third energy level in a Bohr model can hold this many electrons:

The element that has the electron configuration of: 1s² 2s² 2p⁶ 3s² 3p⁴ is:

This element can be referred to as the "backbone" of life and is the most abundant on earth.

The atomic mass of an atom can be calculated by using which of the following formulas:

The number of neutrons can be determined by which formula:

Dimitri Mendeleev originally organized the periodic table based on an element's:

The nucleus contains which set of subatomic particles:

An atom that has a different amount of electrons compared to protons is considered a(n):

The element with the electron configuration of 1s² 2s² 2p² would be:

The group of the periodic table with 2 valence electrons is known as the:

He discovered that the atom was mostly empty space.

Which of the following halogens is the most reactive?

Name of the person to come up with the atomic theory.

Which of the following groups contain ALL Noble Gasses:

An atom with a different number of neutrons than it typically has is considered a(n)

All of the following are considered metalloids EXCEPT:

In a Bohr Model, Sodium (Na) would require this many energy levels: