Unit 2 Test REview

The positively charge particle in an atoms nucleus is the _________.

• electron

• neutron

• proton

• isotopes

An elements identity can be determined from its _____________

• atomic number

• number of neutrons

• atomic mass

• mass number

The smallest particle an element can be divided into is the ______.

• electron

• neutron

• isotope

• atom

The model of the atom that describes electrons scattered through out a ball of positive charges.

• Bohr

• Rutherford

• Thomson

• Dalton

An elements ________ number tells the number of protons in the nucleus.

• mass

• atomic

• electron

• isotope

Negatively charge particles in an atom are called _________.

• protons

• neutron

• electrons

• atoms

The row in the periodic table are called _________.

• families

• periods

• groups

• friends

Mendeleev arranged his periodic table in order of increasing atomic __________________.

• mass

• number

• name

• properties

The average mass of all the isotopes of an element is called the

• atomic mass

• chemical symbol

• atomic number

• electrons

Moving across the periodic table from left to right, one finds, in order metals, then ________, and then non metals.

• sodium

• gasses

• solids

• metalloids