Question

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Answer 1

Answer:

no.of protons=13

no.of neutrons=14

no.of valency=5

Iam sorry.i don't no about formula.

Answer 2

13 Protons & 1 neutron

+3 valency

XCl3

Explanation:

$X^{27}_{13}$ has 27 as superscript which denotes its number of nucleons (neutrons + protons) & the subscript below the symbol denotes number of protons.

13 Protons

and  $27-13\times 2=1 \rm\ neutron$

Its valency will be$=+3$ using 2$n^2$ rule of electrons distribution.

Since Chlorine has -1 valency it will form a compound having formula as $XCl_3$

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TOPIC: valency, atomic number, atomic mass

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