Multiple choice

An element with atomic number 13 has

  1. 13 neutrons in the nucleus

  2. three valence electrons

  3. 13 electrons in the valence shell

  4. three unpaired electrons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An element with atomic number 13 has electronic configuration as 1s2, 2s2, 2p6, 3s2, 3p1. So it has 3 electrons in the valence shell.

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