Two atoms, X and Y are given below.
` ""_(9)^(19)X , ""_(10)^(20)Y`
Are both atoms of the same element? Explain.

Explanation

To determine whether the two atoms, X and Y, are of the same element, we need to analyze their atomic numbers and mass numbers.

### Step 1: Identify the atomic numbers
- The atomic number of atom X is 9 (represented as \( _{9}^{19}X \)).
- The atomic number of atom Y is 10 (represented as \( _{10}^{20}Y \)).

### Step 2: Understand the significance of atomic numbers
The atomic number of an element is defined as the number of protons in the nucleus of an atom. It uniquely identifies an element. Atoms with different atomic numbers are different elements.
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