Electronegativity is the property of the element to attract electrons to its nucleus. The trend of electronegativity in the periodic table is decreasing from right to left and decreasing from top to bottom. hence from the given elements, the element with the highest electronegativity should be A.beryllium
No, Heat moves from concentrations of high to low.
The answer is A.
A pure substance is pure, so it cannot be separated in most cases.
5 Na molecules and 5 Cl molecules
