Periodic Table

Unit of measurement for atomic particles is _________ (amu).

How are elements abbreviated on the Periodic Table?

The number of neutrons idenfities what the atomic number of an element is?

__________ does not have an electrical charge?

Electrons have an electrical charge of 1-.

Vertical columns in the periodic table are periods of elements with similar properties.

Protons have an electrical charge of 1+.

In the late 1800's Dimitri Mendeleev devised the first periodic table based on atomic masses .

____________ are semiconductors that are found on the zigzag line.

The sum of the number of protons and neutrons in the nucleus of an atom is the mass number.

____________ are solid at room temperate and to the left of the zigzag line.

Elements are organized in the ____________ by increasing the atomic number.

____________ is the number of protons in an atom.

Horizontal rows of elements on the periodic table are called periods.

Atoms that are the same element but have a different number of neutrons are ___________.

In 1913, Henry G.J. Mosely arranged the elements by atomic number rather than atomic mass.

___________ are not mallebale or shiny and are found to the rigth of the zigzag line.