Question

19 true or false 1 point
reactivity is a key difference between the elements in the first and last columns of the periodic table.
true
false
20 multiple choice 1 point
which element has the greatest electronegativity?
oxygen
carbon
boron
nitrogen

Explanation:

Question 19 (True or False)

The first column of the periodic table (alkali metals) has highly reactive elements, while the last column (noble gases) has very unreactive (inert) elements. So reactivity is a key difference.

Electronegativity increases across a period (from left to right). Among oxygen, carbon, boron, and nitrogen, oxygen is the rightmost in the period, so it has the greatest electronegativity.

Answer:

True

Question 20 (Multiple Choice)