The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (Mgo).
2Mg + O2 → 2Mgo
Niven wants to calculate the mass of Mgo that is produced by the burning of 28.0 g of Mg. What is the first step in
Niven's calculation?
O Balance the chemical equation.
O Convert grams of Mg to moles.
O Determine whether heat is given off by this reaction.
O Find the number of Mg atoms in the sample.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.