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Helium and iodine, carbon and fluorine, and hydrogen and oxygen are three pairs of ions.
If you want me to pick the correct item from a list of choices for you, you'll have to let me see the list.
VSEPR theory, valence shell electron pair theory. First determine the number of atoms, X, and electron pairs, E, around the central atom. Write these out as AXnEm Look up a list of the AXE shapes. Or better as you may not be give a list in the test, you can actually work these out yourself. The idea is that electron pair bonds and electron pairs repel each other simple examples are methane, CH4, AX4, tetrahedral bonds ammonia, AX3E, so tetrahedral bonds and pairs, but one position is a lone pair, atoms are trigonal. water AX2E2, tetrahedral bonds and pairs, two positions are lone pairs, so bent. See link for a reasonable write up.
Per the choices given, the correct sequence in phagocytosis would be: chemotaxis, adherence, ingestion, digestion, killing
peat, lignite, bituminous, anthracite.
Na+OH-
Sodium is as the cation Na+; and the anion is (OH)-.
Na: positive; OH: negative
Na:positive Ci:negative
Na: positive; CL: negative
A way to show factor pairs in a list of all the factors of a number. A factor rainbow can be used to check whether a list of factors is correct.
The factor pairs are the length and width of the rectangles.
16,18,24,4
One to one.
on the list
Too many to list.
dichotomous key