Give the number of protons and number of neutrons in the nucleus of each the following: (16.1) a. sodium-25 b. nickel-61 c. rubidium- 84 d. silver-110

How many protons and how many neutrons are there in a nucleus of
(a) neon, $76 \mathrm{Ne}$
(b) zinc, 557 ( $\mathrm{Z}$
(c) silver, ${ }^{10} \mathrm{Ag}$.

An oxygen isotope, ${ }_{8}^{16} \mathrm{O}$, has a nuclear mass of 15.994915 u. a. What is the mass defect of this isotope? b. What is the binding energy of its nucleus?

Suppose an organism usually has 24 chromosomes in its nucleus. How many chromatids would it have just after the $S$ phase of the cell cycle?

A nucleus of 4 neutrons and 4 protons that is surrounded by 2 orbiting electrons is

(a) a positive ion.

(b) a negative ion.

(c ) an alpha particle

(d) a beta particle

The two ions $K^+}and $Ca^{2+}$ each have 18 electrons surrounding the nucleus. Which would you expect to have the smaller radius? Why?

Near the surface of the nucleus of a lead atom, the electric field has a strength of $3.4 \times 10^{21} \mathrm{~V} / \mathrm{m}$. What is the energy density in this field?

An example of a "pick-up" nuclear reaction is $_{2}^{3} \mathrm{He}+ _{6}^{12} \mathrm{C} \rightarrow \mathrm{X}+\alpha .$ What is the resulting nucleus?

The element oxygen has three naturally occurring isotopes, with 8, 9, and 10 neutrons in the nucleus, respectively. Write the full chemical symbols for these three isotopes.

Show that the magnetic dipole moment M of an electron orbiting the proton nucleus of a hydrogen atom is related to the orbital momentum $L$ of the electron by

$$M=\frac{e}{2 m} L.$$

Calculate the nuclear binding energy of the nucleus ${ }_{11}^{23} \mathrm{Na}$. The measured atomic mass of $\frac{23}{11} \mathrm{Na}$ is $22.989767$ amu.

Give the number of protons and number of neutrons in the nucleus of each of the following: (16.1) a. boron-10 b. zinc-72 c. iron- 59 d. gold-198

Calculate the mass defect for the neon-20 nucleus. The mass of neon-20 is $19.992440 ~u$. (Hint: How many protons and neutrons does neon-20 have?)

Natural aluminum is all $_{13}^{27} \mathrm{Al}$. If it absorbs a neutron, what does it become? Does it decay by $\beta^{+}$ or $\beta^{-} ?$ What will be the product nucleus?