1. As the first five elements in group 15 are considered in order of increasing atomic number , first ionization energy 1. Decreases
2. Increases
3. Decreases then increases
4. Increases then decreases

2. Based on table S , an atom of which element has the strongest attraction for electrons in a chemical bond ?
1. Aluminum
2.Chlorine
3.Magnesium
4.Sulfur

3. Which element reacts with oxygen to form ionic bonds ?
1.Calcium
2.Hydrogen
3.Chlorine
4.Nitrogen

its mg hope this

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o