Scelta multipla
How many valence electrons does a nitrogen atom have?
158
views
10. Periodic Properties of the Elements
Valence Electrons of Elements
Scelta multipla
How many valence electrons does the element helium (He) have?
A
8
B
1
C
2
D
0
Guida verificata passo dopo passo1
Identify the element in question, which is helium (He).
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of helium. Since helium has an atomic number of 2, it has 2 electrons.
Write the electron configuration for helium: \$1s^2$, meaning both electrons are in the first energy level (shell).
Since the first shell can hold up to 2 electrons and helium's electrons are both in this shell, helium has 2 valence electrons.
Video correlati
Pratica correlata
