Question

the electron configuration of an atom is not a tool we can use to explain the reactivity of an atom

true or false

we know that samples of magnesium and calcium look simpler and react in much the same way because of the periodic law

true or false

samples of sodium and magnesium both look similar and react similar because of the periodic law
true or false

according to the trend we've learned helium is the most electronegative atom on the periodic table
true or false

Answer 1

@Jamierox4ev3r
@pooja195

Answer 2

@sweetburger

Answer 3

@triciaal

Answer 4

Did all chemistry but that was more than 30 years ago
think 1 is false the electronic configuration tells number of electrons available for reaction eg Na 1 outer to lose for ionic
Mg and Ca both 2+ what is the periodic law?

Answer 5

1) EC tells you how many electrons are on the outer most (Valence) shell and therefore their propensity to react by donating or accepting electrons (or sharing).
2) Yes, law of periods say that going down a group (i.e scrolling through periods), elements tend to have very similar chemical properties.
3) Mg and Na are not part of the same group and are in the same period (rather than different), therefore their reactivity cannot be solely explained by periodic law.
4) He is in Group VIII (or 18) which has a full valence shell. Therefore it does not want to accept electrons (electronegativity is a measure of how how strongly an atom wants to attract bonding electrons). In fact He, Ne, Ar, Kr etc. are all inert gases meaning that they are non-reactive under normal conditions because they already have a complete valence shell, which is the state all atoms wish to attain to.