| From the following elements: |
| \[_{4}Be;{{\,}_{9}}F;{{\,}_{19}}K;{{\,}_{20}}Ca\] |
| (i) Select the element having one electron in the outermost shell. |
| (ii) two elements of the same group. |
| Write the formula of and mention the nature of the compound formed by the union of \[_{\mathbf{19}}\mathbf{K}\] and element X(2, 8, 7). |
Answer:
(i) Potassium K (ii) Be and Ca KX and the compound is ionic in nature.
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