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Q2.
The diagram shows a human sperm cell.
middle piece
nucleus
tail
head
(a) How many chromosomes are there in the nucleus?
(b) A sample of semen contains 40 million sperm cells. Only sixty percent of these
sperm cells are capable of swimming.
Calculate how many sperm cells in this semen sample are capable of swimming.
Show your working.
(2

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph