Atoms of elements in Groups 13-18 have 10 fewer valence electrons than their groups numbers.However , helium atoms have only 2 valence electrons.
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An atom from group 16 (also known as group VIA) has 6 valence electrons. Group 16 elements, also known as the oxygen family, are located in the Periodic Table between group 15 and group 17.
Elements in the 16th group has 6 electrons in their outermost energy level. That means they have 6 valence electrons. Oxygen,Sulfur are in the 16th group.
Elements in group 16 are in the p block, and will have 6 valence shell electrons. So, the general configuration will be ns2 np4 with n corresponding to the period.
A neutral atom of silicon has 4 valence electrons. Silicon is in Group 14 of the periodic table, so it has 4 valence electrons in its outermost shell.
A neutral sulfur atom has 6 valence electrons. Sulfur is in group 16 of the periodic table, so it has 6 valence electrons in its outermost shell.
There are 7 valence electrons in a neutral atom of fluorine.
A chlorine atom has 7 valence electrons because it is in Group 17 of the periodic table. The electron configuration Ne3s23p5 represents the arrangement of electrons in the atom, with the 3s and 3p sublevels containing a total of 5 electrons.
There are two non-valence electrons in a neturol boron atom. The electronic configuration of neutral boron is 1s2, 2s2 2p1. The three electrons in the 2d shell are the valence electrons; the non--valence electrons are in the 1s orbital.