Question

2. Calculate the number of neutrons in the following atoms : a) 13A1 27 b) ispl
3. Make a model of electronic configuration of Na and Cl by using beads.
4. For an atom ‘X'.K, L and Mshells are completely filled. How many electrons
present in it?
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Answer 1

${ \red{ \bold{ { \underline{Question \: 2:-}}}}}$

▪ calculate the number of neutrons in the following atoms-

a) 13 Al 27

${ \purple{ \bold{ \underline{Solution:-}}}}$
the given atom is aluminum...

▪ atomic number = Z = 13

▪ mass number = A = 27

☆ atomic number = Number of protons

= Number of electrons = 13

☆ mass number = Number of protons + Number of neutrons = 27

● number of neutrons = mass number- number of protons

= 27 - 13

${ \red{ \boxed{ \bold{no. \: of \: neutrons \: = 14}}}}$

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${ \red{ \bold{ \underline{Question \:3:-}}}}$

▪ make a model of electronic configurations of Na and Cl by using beads.

${ \purple{ \bold{ \underline{ Solution}}}}$
refer to the attachment for the solution of this question....

electronic configurations :-

● Na - sodium

number of electrons = 11

K L M
2 8 1

● Cl - chlorine

number of electrons = 17

K L M
2 8 7

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${ \red{ \bold{ \underline{Question \: 4:-}}}}$

▪For an atom ' X ' , K, L , and M shells are completely filled. how many electrons are present in it??

${ \purple{ \bold{ \underline{Solution:-}}}}$

¤ it is given in the question that

K, L and M shells are completely filled with electrons in the atom 'X'

▪ K shell accommodates maximum 2 electrons

▪ L shell can accommodate maximum 8 electrons

▪ M shell can accommodate maximum 8 electrons

therefore,

total number of electrons in atom'X' = 2+ 8 + 8

${ \red{ \boxed{ \bold{no. \: of \: electrons \: = \: 18}}}}$

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${ \huge{ \underline{ hope \: it \: helps \: u}}}$

Answer 2

Explanation:

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please sorry for .........