Calcium.
For an element to be stable, it must have a full outer shell (valence shell) of electrons. An element with a full outer shell of electrons will act like its nearest noble gas and be stable. Most elements require 8 valence electrons to be stable, however H needs 2.
Beryllium (Be) has 4 protons and 2 valence electrons.
4 electrons, 2 valence electrons
The formula for beryllium nitrate is Be(NO3)2.
Zinc with 2 Valence electrons
calcium
For an element to be stable, it must have a full outer shell (valence shell) of electrons. An element with a full outer shell of electrons will act like its nearest noble gas and be stable. Most elements require 8 valence electrons to be stable, however H needs 2.
an element with 2 valence electrons can obtain a stable electron configuration by "kicking out" two electrons to have the same electron config as the noble gas in the previous period
Helium has two valence electrons. It is the only noble gas not to have eight valence electrons. Helium has the electronic configuration 1s2.The Noble gases have eight valence electrons in their outer shell.
ions are formed based upon the valence electrons of the element and if the element is a metal or a nonmetal. S has 6 valence electrons and needs 2 more to be stable. it is a nonmetal. therefore, taking on 2 electrons gives S a -2 charge
A stable atom has 8 electrons in its outer most valence shell. A simple way to remember this is that all atoms want to be like the noble gases which all have 8 electrons (except helium but the reason is complicated and not necessary here)
Helium has 2 electrons (total of 2 electrons and 2 valence electrons)
The number depends on what will fill the outer shell. It can be 2 or 8.
Except for elements 1 and 2, all elements are stable with how many electrons in their outermost (valence) level?
The number depends on what will fill the outer shell. It can be 2 or 8.
Beryllium (Be) has 4 protons and 2 valence electrons.
4 electrons, 2 valence electrons