Physical Science; Atoms and the Periodic Table

The number of protons in an atom is equal to the atomic mass

Horizontal rows of the period table are called:

____________ Developed the first periodic table

The elements Fluorine, Chlorine, and Bromine are also known as:

Which of these properties describes a metal?

Elements arranged in vertical columns on the periodic table are called periods

A certain atom has 26 protons, 26 electrons and 30 neutrons. What is its mass number?

how many electrons does Fluorine have?

Noble gases have seven electrons in the outer energy level

Which atom has 3 protons, 4 neutrons and 3 electrons?

Isotopes are identified by their

All metals are solids at room temperature

Most of the elements on the left of the periodic table are:

Fr (Francium) has how many valence electrons?

The number of ______ determines an elements identity