Periodic Table 1

Front

What is the modern periodic table arranged by?

Back

Atomic number.

Front

What is the central region of an atom called?

Back

Nucleus.

Front

Which group of elements has a varying number of valence electrons?

Back

Transition, Lanthanide, and Actinide metals.

Front

What is a negatively charged subatomic particle?

Back

Electron.

Front

How many neutrons does the isotope of lithium have?

Back

5.

Front

What are the three main subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of valence electrons?

Back

They determine how an element reacts chemically.

Front

What are alkali metals?

Back

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