Question

provide the atomic symbol of an isotope that has forty three protons, fifty six neutrons and thirty nine electrons. question 10 0.5 pts provide the atomic symbol of an isotope that has twenty four protons, thirty neutrons and twenty one electrons.

Explanation:

Step1: Identify element by protons

The number of protons determines the element. For the first - part, with 43 protons, the element is Technetium (Tc). For the second - part, with 24 protons, the element is Chromium (Cr).

Step2: Calculate mass number

The mass number ($A$) is the sum of protons ($p$) and neutrons ($n$). For Tc, $A = 43+56=99$. For Cr, $A = 24 + 30=54$.

Step3: Determine charge

The charge of the ion is determined by the difference between the number of protons and electrons. For Tc, charge $=43 - 39= + 4$. For Cr, charge $=24 - 21=+3$.

Answer:

$_{43}^{99}\text{Tc}^{4 +}$
$_{24}^{54}\text{Cr}^{3+}$