Boron (B) has 3 electrons in the outer shell.
Barium (Ba) has 2 electrons.
Phosphorus (P) has 5 electrons.
Manganese (Mn) has 2 electrons.
The answer is C) P (phosphorus).
Dull (not shiny)
poor conductors of heat and electricity (they are insulators)
weak and brittle (they easily break or shatter when solid)
Yes, because beryllium is less dense and harder than oxygen.
Halogens (atoms with 7 valence electrons) and Hydrogen
or generally, atoms with their shells almost full
