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Atomic Structure · ICSE STD 8 (ICSE - English Medium). 5 questions.

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5 questions · timed · auto-graded

Question 11 Mark
Magnesium atom with electronic configuration $2, 8, 2$ achieves stable electronic configuration by losing two electrons, thereby achieving stable electronic configuration of the nearest noble gas $………… [$neon$/$argon$]$.
Answer
Magnesium atom with electronic configuration $2, 8, 2$ achieves stable electronic configuration by losing two electrons, thereby achieving stable electronic configuration of the nearest noble gas neon.
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Question 21 Mark
An element $Z$ with zero valency is a $………… [$metal$/$noble gas$/$non$-$metal$]$.
Answer
An element $Z$ with zero valency is a noble gas.
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Question 31 Mark
A $………… [$proton$/$neutron$]$ is a sub$-$atomic particle with no charge and unit mass.
Answer
A neutron is a sub$-$atomic particle with no charge and unit mass.
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Question 41 Mark
An element $‘Y’$ has electronic configuration $2, 8, 6$. The element ‘$Y’$ is a $………… [$metal$/$non$-$metal$/$noble gas$].$
Answer
An element ' $Y$ ' has electronic configuration $2,8,6$. The element ' $Y$ ' is a non$-$metal.
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Question 51 Mark
An element $‘X$ has six electrons in its outer or valence shell. Its valency is $………… [+2l – 2l – 1].$
Answer
An element ‘$X$ has six electrons in its outer or valence shell. Its valency is $-2.$
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Fill in the blanks. - CHEMISTRY STD 8 Questions - Vidyadip