An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

How many electrons does this atom have?

How many valence electrons does Hydrogen Have?

How many valence electrons does Na have?

Chlorine ( Cl) has _________ valence electrons.

All of the elements has 4 valence electrons EXCEPT______

What are valence electrons?

Which elements have the most similar chemical properties?

How many valence electrons does carbon have?

The _____ the element is in determines the number of valence electrons it has.

The outer most electrons are called...

This subatomic particle is involved in forming chemical bonds and building compounds...

The vertical (up and down) columns in the Periodic Table are called

What are the three main groups of the periodic table?

It stacks the elements in columns according to the number of valence electrons in an atom of the element. Valence electrons are those in the outermost shell of the atom and the ones that participate in reactions. The number of valence electrons is associated with the element’s reactivity. Elements with the same number of valence electrons behave in a similar way in reactions and so are grouped together in the same column on the periodic table.

What does the amount of valance electrons determine about an element?