What do elements in the same group of the Periodic Table have in common?

The same number of outer-shell electrons

What does the period number of an element tell you?

The number of occupied electron shells

A larger atom gains an electron less readily because the incoming electron is further from the nucleus

Chlorine displaces bromine and the solution turns orange/brown

Soft, low density and very reactive

They show variable oxidation states and form coloured compounds

They have a full outer shell of electrons, a stable arrangement

12questions. Pick an answer and you'll see why right away.

In what order are the elements arranged in the modern Periodic Table?
What do elements in the same group of the Periodic Table have in common?
What does the period number of an element tell you?
An element has the electronic configuration 2,8,7. Which group and period is it in?
How does the reactivity of the Group I metals change down the group?
Why does reactivity decrease down Group VII (the halogens)?
What happens when chlorine water is added to potassium bromide solution?
Which is a typical property of a Group I metal such as sodium?
Which property is characteristic of the transition elements?
Which of these is commonly used as a catalyst, reflecting a property of the transition elements?
Why are the noble gases (Group 0) unreactive?
Across a period from left to right, how do the elements generally change?