Question

An element X is represented as 11x²³
Answer the given:
i) Atomic number vi) Mass number
ii) Number of protons vii) Number of electrons
iii) Number of neutrons viii) Metal, non-metal or noble gas
iv) Valency ix) Type of bond formed
v) Identify the element x) Atomicity of the given element

Answer 1

Answer:

Atomic number = proton count

Atomic mass = proton count + neutron count

Neutron count = atomic mass - proton count

Your proton count, the atomic number, is 11. The mass is 23. This gives us the following:

Neutron count = 23 - 11

Neutron count = 12

The element is determined by the proton count. Unless I’m very much mistaken, element 11 is sodium (or natrium, depending on where you live). We note isotopes as [element]-[atomic mass]. This means that your isotope is written as sodium-23.

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Answer 2

An element X is represented as ₁₁X²³

Any element can be represented as  $_ZX^A$

A = mass number

Z = atomic number

Comparing ₁₁X²³ with  $_ZX^A$

i) Atomic number = Z = 11

ii)  Number of protons = atomic number = Z = 11

iii)  Number of neutrons

⇒ Number of protons = atomic number = Z = 11

⇒ Mass number = Total protons - Total neutrons

⇒ Total neutrons = 23 -11

⇒ Total neutrons = 22

iv) Valency:

Electronic configuration = $1s^22s^22p^63s^1$

Valency = + 1

v) Element = Sodium

vi) Mass number = A = 23

vii) Number of electrons

⇒ Number of electrons = Number of protons = Z = 11

viii) Sodium is a metal

ix) Ionic bonds

x) Atomicity = 1