Question

in the modern periodic table, the most correct statement about a period is
1) the first element is an alkali metal and the last element is a halogen
2) the first element is a noble gas and the last element is an alkali metal
3) the first element is an alkali metal and the last element is a noble gas
4) the first element is an alkali metal except period 1 and the last element has 7 valence electrons

Answer 1

3. is the most correct.

Answer 2

The correct statement about a period is the first element is an alkali metal and the last element is a noble gas.

Explanation:

A period in a periodic table is a horizontal line and it moves across left to right in each row of the periodic table.

At the top left side of the periodic table alkali metals are placed and at the extreme right of the periodic table noble gases are placed. This means that the first element is an alkali metal and the last element is a noble gas in the periodic table.

For example, the first element of period 3 is sodium and last element of thid period is argon.

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