How does the number of valence electrons in sodium (Na) compare to the number of valence electrons in calcium (Ca)?

The grooves or folds of the brain are called

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Which element would mostly likely have an electron affinity measuring closest to zero