Ch 4 The Atom and the Periodic table

Gallium has an atomic number of

The only group that is not reactive is

The only element that has 0 neutrons is

The majority of the elements on the periodic table are

Rearranged the periodic table by atomic number.

An isotope is a version of an element that has a different number of

The mass of an electron is

Chlorine needs ____ electron(s) to complete its outer shell

Unit used in chemistry to represent 6.02 x 10 ²³ particles.

Discovered the nucleus by performing the Gold Foil experiment.

An element with 28 protons is

If an isotope of Oxygen, Oxygen-13, has 8 protons, how many protons does Oxygen-14 have?

The current atomic model that proposed that e- travel as waves in orbitals within energy levels

Which element is an Alkaline Earth metal?

The most reactive metals are found in

Which element is dull, brittle and a poor conductor?

Which group contains very reactive nonmetals?

A subatomic particle with no charge and a mass of 1 amu

The mass number of Fluorine is

If Carbon-14 has 6 protons, it has ____ electrons

Groups 3-12 are known as the

Proposed the Planetary Model which placed e- in specific energy levels orbiting the nucleus.

Helium is in group 18, but it has ____ valence electrons

Magnesium has ____ protons

Calcium has ____ valence electrons

Was the 1st person to arrange a periodic table, arranged it by atomic mass.

The charge of a proton is

1st person to propose an indivisible particle called "atomos" making up the entire universe.

______ are ductile, malleable, shiny and good conductors

Electrons in the outer most shell are called

The mass number is the number of

How many neutrons does Chlorine have?

There are ____ groups on the periodic table