Ch 4 The Atom and the Periodic table

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

The charge of a proton is

Rearranged the periodic table by atomic number.

How many neutrons does Chlorine have?

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

The only element that has 0 neutrons is

Electrons in the outer most shell are called

______ are ductile, malleable, shiny and good conductors

There are ____ groups on the periodic table

The mass number of Fluorine is

The most reactive metals are found in

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

The mass of an electron is

Which element is an Alkaline Earth metal?

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

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

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

Which group contains very reactive nonmetals?

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

Which element is dull, brittle and a poor conductor?

The majority of the elements on the periodic table are

Magnesium has ____ protons

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

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

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

The only group that is not reactive is

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

Calcium has ____ valence electrons

Groups 3-12 are known as the

The mass number is the number of

An element with 28 protons is

Gallium has an atomic number of

Discovered the nucleus by performing the Gold Foil experiment.