Which of the following elements (shown as Bohr models) would have the lowest ionization energy?
Element B
Element C
Element D
e
ts
Element A
7e-
8e-
2e-
le-
2e
8e
8e
2e-
1e-
8e-
2e-
of
ce
A
Element A
B
Element B
С
Element
D
Element D

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

The answer to your q it is d

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane

Ineed a picture or something