Which of the following statements is(are) true? For the false statements, correct them. A family of elements is also known as a period of elements.

Describe the calculation of cost of goods sold when using the periodic inventory system.

What is the difference between delivery cycle time and throughput time? What four elements make up throughput time? What elements of throughput time are value-added and what elements are non-value-added?

The melting points of ionic compounds with cations in the same group follow a pattern. To see this, plot the melt ing point of each of the ionic compounds in the table below on the y-axis and the atomic number of the element from which the cation is made on the x-axis. a. What trend do you notice in the melting points as you move down Group 2? b. The compound $BeCl_2$ has a melting point of 405 $^ { \circ } \mathrm { C }$. Is this likely to be an ionic compound? Explain. (Hint: Locate beryllium in the periodic table .) c. Predict the melting point of the ionic compound $RaCl_2$. (Hint: Check the periodic table, and compare radium's location with the location of magnesium, calcium, strontium, and barium.) Melting Points of Some Ionic Compounds

$$\begin{matrix} \text{Compound} & \ {Melting Point (^ { \circ } \mathrm { C })}\\ \ {MgCl_2} & \text{714}\\ \ {CaCl_2} & \text{782}\\ \ {SrCl_2} & \text{875}\\ \ {BaCl_2} & \text{963}\\ \end{matrix}$$

Distinguish between periodic tenancy and tenancy for a specific time when renting housing.

The first atoms of seaborgium (Sg) were identified in 1974. The longest-lived isotope of Sg has a mass number of 266. Atoms of Sg are very unstable, and it is therefore difficult to study this element's properties. Based on the position of Sg in the periodic table, what element should it most closely resemble in its chemical properties?

For each of the following, say whether it would be ionic or covalent (use your periodic table to figure out the answers). a. $\mathrm{NaBr}$ b. $\mathrm{CH}_4$ c. $\mathrm{SO}_2$ d. $\mathrm{NH}_3$ e. $\mathrm{MgO}$ f. CuCl g. $\mathrm{HCOOH}$ h. $\mathrm{SF}_6$

Identify the following term or individual and explain their significance. Family and Medical Leave Act

Graph a periodic function with amplitude 10 and period $\frac{1}{2} \pi$.

Determine the atomic number of calcium (Ca) using the periodic table on the inside cover of your book. What is the electron configuration of the Ca atom?
a) $[\mathrm{Ne}] 4 s^2$
b) $[A r] 4 s^2$
c) $[\mathrm{Kr}] 4 s^2$
d) $[\mathrm{Ar}]$
e) $[\mathrm{Kr}]$

Identify the parent nuclide and write the complete decay equation in the $_{Z}^{A} X_{N}$ notation. Refer to the periodic table for values of Z. $\alpha$ decay producing $^{228} \mathrm{Ra}.$ The parent nuclide is nearly 100% of the natural element and is found in gas lantern mantles and in metal alloys used in jets $(^{228} \mathrm{Ra}$ is also radioactive).

Suppose you need to store a list of elements. If the number of elements in the program is fixed, what data structure should you use? If the number of elements in the program changes, what data structure should you use?

Give the periodic group number and number of valence electron for each the atom.

Ne

The ratio

$$r _ { \mathrm { X } } / r _ { \mathrm { T } }$$

of the radius of an unknown nucleus

$$_ { Z } ^ { A } \mathrm { X }$$

to a tritium nucleus

$$_ { 1} ^ { 3 } \mathrm { T }$$

is

$$\frac { r _ { \mathrm { X } } } { r _ { \mathrm { T } } } = 1.10$$

Both nuclei contain the same number of neutrons. Identify the unknown nucleus in the form

$$_ { Z } ^ { A } \mathrm { X }$$

Use periodic table as needed.