Question

what is the element x given the following:
_{12}^{24}x^{2 +}
helium
sodium
magnesium
calcium
question 2
1 pts
what is the element x given the following:
_{7}^{14}x^{3 -}
phosphorous
oxygen
nitrogen
sodium

Explanation:

Step1: Identify element notation meaning

In the notation $_{Z}^{A}X^{n\pm}$, $Z$ is the atomic number and $A$ is the mass - number.

Step2: Solve for first question

For $_{12}^{24}X^{2 +}$, the atomic number $Z = 12$. Looking at the periodic table, the element with atomic number 12 is Magnesium.

Step3: Solve for second question

For $_{7}^{14}X^{3 -}$, the atomic number $Z=7$. Looking at the periodic table, the element with atomic number 7 is Nitrogen.

Answer:

1. Magnesium
2. Nitrogen