how many valence electron does helium have? ¿cuántos electrones de valencia tiene el helio?
how many valence electron does helium have? ¿cuántos electrones de valencia tiene el helio?
Answer
Explanation:
Step1: Recall helium's electron - configuration
Helium has an atomic number of 2. Its electron - configuration is (1s^{2}).
Step2: Identify valence electrons
The outermost shell of helium is the first shell ((n = 1)), and it has 2 electrons in this shell. For elements in the first period, the first shell is the valence shell.
Answer:
2