Boron and aluminium are both found in group 3 of the modem periodic table. State what this tells you about the electronic configuration of both elements.
Explain what this tells you about the chemical properties of the two elements

Valence Electrons = 3

Explanation:

Not counting the transition metals, Boron and Aluminum are in group 3, but are actually in group 13. These elements usually have 3 valence electrons. Every element wants a full octet, or a full valence shell of eight electrons. It can do this by reacting with other elements through some bonds. Elements like these are not very reactive, especially in comparison to the alkali metals.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

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