Atoms & Periodic Table Review

True or false: The most energy levels an atom can have is 7.

An atom has 9 protons, 10 neutrons, and 9 electrons. Which element is this atom?

What's the charge of a nucleus of an atom with 5 protons, 6 neutrons, and 5 electrons?

Which group number contains the nonreactive elements?

True or false: There are 18 periods on the periodic table.

What is the atomic number of Helium (He)?

On which side of the periodic table are the nonreactive elements located?

On which side of the periodic table are the metals located?

Which of the following elements is a reactive metal?

Which element has similar properties to Sodium (Na) but a lower atomic mass?

True or false: atomic mass and atomic number increase from left to right across a period.

Which of the following elements is located in the same group number as Magnesium (Mg)?

Which element has similar properties to Bromine (Br) but a lower atomic mass?

What is the atomic mass of Carbon (C)?

True or false: the number of energy levels increases down a group.

The most reactive elements have how many valence electrons?

All of the following are found in the nucleus of an atom EXCEPT: