The elements, si, ga, as, ge, al, cd, s and se are all used in the manufacture of various semiconductor devices. write the expected electron configuration for these atoms.

Al (Group 13, Row 3) Al = [Ne] 3s^2 3p

Si (Group 14, Row 3) Si = [Ne] 3s^2 3p^2

S(Group 16, Row 3) S = [Ne] 3s^2 3p^4

Ga (Group 13, Row 4) Ga = [Ar] 4s^2 3d^10 4p

Ge (Group 14, Row 4) Ge = [Ar] 4s^2 3d^10 4p^2

As (Group 15, Row 4) As = [Ar] 4s^2 3d^10 4p^3

Se (Group 16, Row 4) Se = [Ar] 4s^2 3d^10 4p^4

Cd (Group 10, Row 5) Cd = [Kr] 5s^2 4d^10

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.