chemistry- periodic table

Q: How are elements arranged in the Periodic Table?

In order of atomic (proton) number, in groups (columns) and periods (rows).

What do elements in the same group have in common?

The same number of electrons in their outer shell, giving them similar chemical properties.

What do elements in the same period have in common?

The Sam number of electron shells

What does an element’s electronic configuration indicate?

The number of electrons in each shell around the nucleus.

How many electrons can the 1st, 2nd, and 3rd shells hold?

1st shell: 2 electrons; 2nd and 3rd shells: 8 electrons each.

How can sodium’s electronic configuration be represented?

2.8.1

How can you classify elements as metals or non-metals using conductivity and oxide properties?

Metals conduct electricity and form basic oxides; non-metals do not conduct (except graphite) and form acidic oxides.

Where are metals found on the Periodic Table?

On the left and toward the bottom.

Where are non-metals found on the Periodic Table?

On the right and toward the top.

What does the group number tell you about an element?

The number of electrons in its outer shell.

What does the period number tell you about an element?

The number of electron shells it has.

Why do elements in the same group have similar chemical properties?

Because they have the same number of electrons in their outer shell.

Why are noble gases (Group 0) unreactive?

They have a stable arrangement of electrons with full outer shells (helium has 2, others have 8).

What are all substances made of?

Atoms