From the following elements:
$_{4} B e;_{9} F;_{19} K;_{20} C a$
(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 $_{19} K$ and element X(2,8,7).

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Solution

Element Electronic configuration
Be
F
K
Ca 2,2
2,7
2,8,8,1
2,8,8,2
i) K
ii) Be and Ca as both have the same number of valence electrons, i.e.,2 hence belongs to the same group.
iii) Ionic or electrovalent bond is formed because K is metal and X ( chlorine) is a nonmetal.

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(a) To which group or period of the periodic table do these elements belong?

(b) What would be the nature of the compound formed by a combination of elements B and F?

(d) Which one of the eight elements is most likely to be found in the gaseous state at room temperature?

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Element	Electronic configuration
Be F K Ca	2,2 2,7 2,8,8,1 2,8,8,2

From the following elements:4Be;9F;19K;20Ca(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 of19K and element X(2,8,7).

Element Electronic configurationBeFKCa2,2 2,72,8,8,12,8,8,2 i) Kii) Be and Ca as both have the same number of valence electrons, i.e.,2 hence belongs to the same group.iii) Ionic or electrovalent bond is formed because K is metal and X ( chlorine) is a nonmetal.

From the following elements:
$_{4} B e;_{9} F;_{19} K;_{20} C a$
(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 $_{19} K$ and element X(2,8,7).

Element Electronic configuration
Be
F
K
Ca 2,2
2,7
2,8,8,1
2,8,8,2
i) K
ii) Be and Ca as both have the same number of valence electrons, i.e.,2 hence belongs to the same group.
iii) Ionic or electrovalent bond is formed because K is metal and X ( chlorine) is a nonmetal.