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.

Question

KnowledgeBoat · Accepted 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: So, we get the formula as

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 28 14
(i) Which one of these atoms has an electronic configuration 2, 7? (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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