Answer all question

1. What are the groups and periods on the periodic table?

2. Define valence electrons. For representative elements, the number of valence electrons in an element is equal to the number in its group. Show that this is true for the following elements: Al, Sr, K, Br, P, S, C.

3. How are the elements of the periodic table arranged?

4. Why are the GASES located on the far right of the periodic table (Group 18) called INERT (inert gases)?

5. A neutral atom of a certain element has 17 electrons. Without consulting the periodic table: a) Write the electronic configuration of the element in the ground state. b) Predict whether the atoms of this element are diamagnetic or paramagnetic.

6. Mention two differences between a metal and a non-metal.