The atomic numbers of Al, Na and Be respectively are:

13, 11 and 4

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11, 13 and 4

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13, 11 and 6

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13, 6 and 11

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Solution

The correct option is A
13, 11 and 4

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons. Here, the atomic numbers of Al, Na and Be respectively are 13, 11 and 4.

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Similar questions

Explain why 7*11*13+13 and 7×6×5×4×3+5 are composite numbers.

7 \times 11 \times 13 + 13

7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5

Question 6
Explain why $7 \times 11 \times 13 + 13$ and $7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5$ are composite numbers.

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