Periodic Table - Groups and Periods

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How many valence electrons does an atom in Group 12 have?

Back

An atom in Group 12 has 2 valence electrons.

Front

What is the significance of the period number in the periodic table?

Back

The period number indicates the number of energy shells an element has.

Front

Which elements are likely to have similar chemical properties?

Back

Elements in the same group (vertical column) of the periodic table have similar chemical properties.

Front

What happens to reactivity as you move from left to right across a period?

Back

Elements become less reactive as you move from left to right across a period.

Front

What group does the element Zinc (Zn) belong to?

Back

Zinc (Zn) belongs to Group 12.

Front

What is the general trend of reactivity for alkali metals?

Back

Alkali metals become more reactive as you move down the group.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which also determines the element's identity.

Front

What are noble gases?

Back

Noble gases are elements in Group 18 that are colorless, odorless, and have very low reactivity due to having a full valence shell.

Front

What is the difference between groups and periods in the periodic table?

Back

Groups are vertical columns that contain elements with similar properties, while periods are horizontal rows that indicate the number of energy shells.