Periodic Table

Front

Who proposed a model with electrons moving in specific layers?

Back

Bohr

Front

This element has two valence electrons and two energy levels?

Back

Beryllium (Be)

Front

How many protons and electrons does nickel have?

Back

28

Front

Who discovered the electrons?

Back

Thomson

Front

What are the vertical columns on the periodic table called?

Back

groups

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a period in the periodic table?

Back

A horizontal row of elements.

Front

What are alkali metals?

Back

Elements in Group 1 of the periodic table, highly reactive.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their properties and atomic structure.

Front

What are noble gases?

Back

Elements in Group 18, known for being inert and non-reactive.