Answer:
1 unshared pair of electrons
Explanation:
In order to draw the Lewis structure, we need to consider the octet rule: atoms tend to share electrons to complete their valence shell with 8 electrons. In the case of H, it has to complete a duet (2 valence electrons).
N has 5 valence electrons, so it has to share 3 pairs of electrons to reach the octet.
H has 1 valence electron, so it has to share 1 pair of electrons to reach the duet.
In the picture, we can see the resulting Lewis structure. There is 1 unshared pair of electrons on each nitrogen.
This element is Helium. This is because it has two protons and two neutrons in its nucleus. this makes it have the atomic mass of approximately four atomic mass units. It also has two electrons in the first energy level. . It is therefore a noble gas since this is the only energy level and it obeys the 2n² rule for the filling of energy levels. n in this case is 1 making the maximum number of electrons in the first energy level to be 2.
Copper II oxide is a compound.
Explanation:
Each sample has the same number of molecules.
simple
1 mole of oxygen have no. of molecules 1×6.022×10^23
and one mole of nitrogen have 1×6.62×10^23 molecules
Answer:
B
Explanation:
B is the best showing of a chemical reaction out of the choices
