Question

We need to use the table to provide the answer, help ;-;​

Answer 1

a. The symbol
`\tt _(11)^(23)Na`,
`\tt _(18)^(40)Ar`,
`\tt _(15)^(31)P^(3-)`,
`\tt _(13)^(27)Al^(3+)`

b. Isotope of Na

Further explanation

Atomic number=number of protons=number of electrons(neutral atom)

Number of neutrons=mass number-atomic number

Mass number=protons+neutrons

B. atomic number=11, mass number=11+12=23⇒Sodium

`\tt _(11)^(23)Na`

C. atomic number=18, mass number=18+22=40⇒Argon

`\tt _(18)^(40)Ar`

D. atomic number=15, mass number=15+16=31, charge -3(electron-proton)⇒Phosphor

`\tt _(15)^(31)P^(3-)`

E. atomic number=13, mass number=13+14=27, charge +3(proton-electron)⇒Aluminium

`\tt _(13)^(27)Al^(3+)`

Isotope=the same atomic mass, different neutron(mass number)

So the atom⇒isotope of Sodium(Na)