Multiple choice

Helium is a noble gas.It is placed in __________.

  1. the s-block

  2. the p-block

  3. the d-block

  4. the f-block
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A Correct answer
Explanation

The s-block of the periodic table of elements consists of the first two groups: the alkali metals and alkaline earth metals, plus hydrogen and helium.These elements are distinguished by the property that in the atomic ground state, the highest energy electron is in a s-orbital. Except in hydrogen and helium, these electrons are very easily lost to form positive ions.

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