Question

Which element would have this representation: 43 ? 21 Question 4 options: Technetium Scandium Titanium Cobalt

Answer 1

The naswer to your question is Scandium

Step-by-step explanation:

43 means the atomic mass is normally presented as a power

21 means atomic number is always a subscript

₂₁ ? ⁴³

Technetium ₄₃Tc⁹⁸

Scandium ₂₁Sc⁴⁴

Titanium ₂₁Ti⁴⁷

Cobalt ₂₇Co⁵⁹

Answer 2

B. Scandium is the answer

Step-by-step explanation:

`Sc^(43)_(21)`

When we look at this Nuclide symbol we get to know that 21 is the atomic number as it is in the subscript and 43 is the mass as it is in the superscript.

We identify an element from its atomic number by looking at the periodic table.

Atomic number 21 is element Scandium. Sc-43 is one of the isotope mentioned here.

We don’t use mass number to identify an atom.