Chemistry

Five atoms are labelled V to Z
Atoms Mass Number Atomic number
V 40 20
W 19 9
X 7 3
Y 16 8
Z 14 7
(i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?
(ii) Write down the formula of the compound formed by atoms X and Y.

Atoms	Mass Number	Atomic number
V	40	20
W	19	9
X	7	3
Y	16	8
Z	14	7

Atomic Structure

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Answer

(i) As Z has atomic number of 7, hence it has 7 protons. Electronic configuration of 2, 7 means the atom has 2 + 7 = 9 electrons. Therefore, element W has electronic configuration 2, 7 since its atomic number is 9.

(ii) Number of electron in X is 3. Therefore, electronic configuration = (2, 1). As X will try to lose 1 electron to attain stable state, hence, X has valency [1+]

Number of electron in Y is 8. Therefore, electronic configuration = (2, 6). As Y will try to gain 2 electrons to attain stable state, hence, Y has valency [2-]

Since valency of X is 1+ and valency of Y is 2-

Formula of the compound:

$\text{X}^{1+} \phantom{\nearrow} \text{Y}^{2-} \\[0.5em] \overset{\phantom{1}{1}}{\text{X}} \space {\searrow}\mathllap{\swarrow} \space \overset{2}{\text{Y}} \Rightarrow \underset{\phantom{2}{2}}{\text{X}} \space {\searrow}\mathllap{\swarrow} \space \underset{1}{\text{Y}} \\[0.5em]$

So, we get the formula as $\bold{X}_2\bold{Y}$

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Chemistry

Five atoms are labelled V to Z
Atoms Mass Number Atomic number
V 40 20
W 19 9
X 7 3
Y 16 8
Z 14 7
(i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?
(ii) Write down the formula of the compound formed by atoms X and Y.

Atomic Structure

Answer

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Five atoms are labelled V to ZAtomsMass NumberAtomic numberV4020W199X73Y168Z147(i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?(ii) Write down the formula of the compound formed by atoms X and Y.

Atomic Structure

Answer

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Five atoms are labelled V to Z
Atoms Mass Number Atomic number
V 40 20
W 19 9
X 7 3
Y 16 8
Z 14 7
(i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?
(ii) Write down the formula of the compound formed by atoms X and Y.

Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one :
(i) forms anion – negative ion;
(ii) forms cation – positive ion;
(iii) has 4 electrons in the outermost orbit.

Ordinary chlorine gas has two isotopes : $^{35}$ and $^{37}{17}\text{Cl}$ in the ratio of 3 : 1. Calculate the relative atomic mass [atomic weight] of chlorine.