The answer is A (The ability to react with oxygen)
Experimental molar mass = 48.45 g/mol. Actual molar mass = 52.98 g/mol. Error in molar mass= (52.98-48.45) = 4.53. Percentage error in molar mass= (Error in molar mass)/Actual molar mass = (4.53/52.98)X100= 8.55 %. The formula utilised here is percentage error= (Exact value - Approximate value)X100/Exact value. First approximate value is to be subtracted from exact value, then divide the number by exact value. Finally, the fraction is to be multiplied by 100 to get percentage error.
Answer:
Halogens are better oxidizing agents than their alkali metal counterparts within the same period
Halogens have a higher first ionization energy than their alkali metal counterparts within the same period.
Halogens have a higher electron affinity than their alkali metal counterparts within the same period.
Halogens have a higher effective nuclear charge than their alkali metal counterparts within the same period
Explanation:
Effective nuclear charge increases across a period and accounts for increase in ionization energy across a period. This explains why halogens in the same period with alkali metals have higher effective bucket charge as well as ionization energy than the alkali metals.
Similarly, electron affinity increased across a period, halogens have greater ekctron affinity than corresponding alkali metals in the same period.
I think it's letter:
B.Coefficients are placed in front of the reactants and/or products