Which is the correct symbol for an isotope of bromine with 35 protons and 38 neutrons? a) 35br38 b) 73br c) 35br d) 73br

Explanation: Atomic number is the number of protons or number of electrons.

Mass number is the sum of number of protons and number of neutrons.

Thus atomic number will be 35 and mass number is 35+38=73.

The representation of element is :

where Z= atomic number, A= mass number , X= chemical symbol of element

The representation of isotope of bromine with atomic number 35 and mass number 73 is :  

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

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