Which correctly summarizes the trend in electron affinity?
it tends to be very high for group 2.
it tends to be more negative across a period.
it tends to remain the same across periods.
it tends to be more negative down a group.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

Which statement best explains the relationship between an area is geography and the temperature of its surface water