Question

6. Number of elements in the first period
7. Elements of second period are known as​

Answer 1

Answer:

Two element in first period

elements of second period are known asbridge elements

Answer 2

Answer:

6), two

There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements.

7)The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.

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Explanation:

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