Why does an increase in the number of protons in the nucleus of an atom
increase the ionization energy of atoms within a period?

As you move left to right, reactivity gets lowered-protons gets increased which results in more attraction therefore less reactivity .

Explanation:

Ionization energy gets increased while going across through a period as the number of protons gets increased, therefore there is more attraction to the nucleus. The more attraction to the nucleus requires the huge energy for the valence e- to be removed.

While moving left to right, reactivity drops - increase in protons therefore more attraction therefore less reactivity .

As you go across, the nuclear charge increases so there is a stronger attraction for electrons therefore it is harder to lose electrons so reactivity decreases.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally