Week 101. Noble gases are nonmetallic elements that

do not readily react with other elements. What accounts for this non-reactivity?

A. Noble gases have 6 valence electronsB. Noble gases have 8 valence electronsC. Noble gases have 10 valence electronsD. Noble gases have 2 valence electrons

2. When a potassium atom (K) forms a potassium ion (K+), the atom A. Gains a protonB. Gains an electronC. Loses a protonD. Loses an electron

3. Which of the following are Alkali MetalsMagnesium Calcium Potassium

Lithium Strontiuma. Beryllium and Lithiumb. Lithium and Potassiumc. Magnesium, Calcium, and Strontiumd. Lithium, Calcium, and Strontium

4. In what section of the periodic table can metalloids be found? a. In the transition metalsb. In the alkali metalsc. Diagonally across the right side of the periodic tabled. Only in the boron family of the periodic table

5. The following table shows the abundance and half-life of 4 of the 15 known carbon isotopes. Which is the MOST common stable isotope of carbon?

a. 8C c. 13Cb. 12C d. 14C

Isotope Natural abundance

Half-Life

8C ~0% 1.99 x 10 -21

s

12C 98.89% Infinite13C 1.11% Infinite14C 1 x 10 -10 % 5,730 years

6. Which of the following radioactive emissions is the largest in size? A. Alpha particle c. Gamma rayB. Beta particle d. X-Ray

7. A scientist detected radiation escaping from a material encased in a thick block of concrete. Identify the type of radiation the scientist MOST likely detected.

a. Beta particles c. Gamma radiationb. Alpha particles d. Radio nucleus

8. Alpha decay produces a new nucleus whose __________ than those respectively of the original nucleus.A) atomic number is 2 more and mass number is 4 moreB) atomic number is 2 less and mass number is 2 lessC) atomic number is 1 less and mass number is 2 lessD) atomic number is 2 less and mass number is 4 less

9. When an isotope releases gamma radiation the atomic number

A)decreases by two and the mass number decreases by four.B)increases by one and the mass number remains the same.C)and the mass number decrease by one.D)and the mass number remain the same.

10. Neodymium 144Nd is a nuclide that undergoes alpha decay. The nuclide that is the product of the decay is:A) 148

62Sm

B) 14256Ba

C) 14059Pr

D) 14058Ce