Periodic Table

Front

In the modern periodic table, elements are arranged by:

Back

atomic number

Front

Which element is found in group 18 period 1?

Back

Helium (He)

Front

Beryllium is in group number______

Back

Group 2

Front

Calcium is most like which of the following?

Back

Barium

Front

The number at the top of each square on the periodic table is the ...

Back

atomic number

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What does the term 'valence electrons' refer to?

Back

Electrons in the outermost shell of an atom that determine its chemical properties.

Front

What is the significance of group 18 in the periodic table?

Back

Group 18 contains noble gases, which are known for their lack of reactivity.

Front

What is the difference between atomic mass and atomic number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while atomic number is the number of protons.

Front

What is a chemical symbol?

Back

A one or two-letter abbreviation used to represent an element.