Chemical bonds are likely to form when
a. two atoms have the same number of electrons.
b. an atom's outer energy level doesn't have the maximum
c. an atom's nucleus has the same number of protons as neu
d. an atom's outer energy level is filled.

Step-by-step explanation:

It would be answer b, because they would bond by giving off and receiving electrons

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

answer: answer is b.

[m < b = 120º]

step-by-step explanation: