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)