Have you started your webassign? a) Yes b) No, haven’t started it c) opened it, but haven’t...

• Have you started your webassign?

a) Yes

b) No, haven’t started it

c) opened it, but haven’t started

• How many protons are in lithium?

a) 1

b) 2

c) 3

d) 4

e) 7

• How many neutrons are in Be?

a) 2

b) 4

c) 5

d) 9

• How many electrons are in a neutral fluorine atom?

a) 9

b) 7

c) 17

d) 10

e) 19

Oxygen and nitrogen are in the same family

a) true

b) false

• Sodium is chemically similar to

a) lithium

b) magnesium

• How many energy levels does chlorine have?

a) zerob) onec) twod) threee) fourf) five

a. bottom, protons + neutrons

b. bottom, protons

c. top, protons + neutrons

d. top, protons

Atomic number is the _____ number and it tells how many ______.

An isotope is an atom with the same number of _______ but a different number of ________.

a. neutrons, protons

b. protons, neutrons

c. protons, electrons

d. electrons, protons

Nuclear reactions involve changes in an atom’s ___________ while chemical reactions involve changes with _________________.

a. nucleus, electrons

b. electrons, nucleus

The reason why atoms undergo radioactive decay is to become unstable.

a. True

b. False

• Calcium is in the ______ family

a. halogen

b. metalloids

c. alkaline earth metals

d. alkali metals

e. transition metals

• helium is in the ______ family

a. halogen

b. metalloids

c. alkaline earth metals

d. alkali metals

e. transition metals

• Lithium composes 53 grams of a 150 gram sample of LiBr. Calculate the percent by mass of lithium.

a. 53.0 %

b. 26.1 %

c. 2.8 %

d. 35.3 %

• What subatomic particle identifies the element?

a. proton

b. neutrons

c. electrons

• If magnesium composes 40% of a 300 gram sample of MgCl2, how many grams of magnesium is present?

a. 12,000 g

b. 120 g

c. 13 g

d. 12 g

Which of the following statements is truea. P+, n0, e- are all the same size

b. n0, e- are the same size

c. n0,P+ are the same size

d. P+, e- are the same size

e. P+, n0, e- are all different sizes

• The half life of francium is 22 minutes. How long would it take for a sample to decompose to 1/16 its original amount?

a. 22 minutesb. 44 minutesc. 66 minutesd. 88 minutese.110 minutesf. 132 minutes

• Classify the mixture: sweet tea

a. heterogeneous

b. homogeneous

• Classify the mixture: bag of Halloween candy

a. heterogeneous

b. homogeneous

• Calculate the average atomic mass:

cesium-133 75%

cesium-132 25%

a. 13275 amu

b. 132.50 amu

c. 132.75 amu

d. I have no idea how to do this

• What is the net charge of an atoms nucleus?

a. negative

b. neutral

c. positive

d. depends on the element

• What two particles are found within the nucleus?

a. neutrons and electronsb. neutrons and protonsc. protons and electronsd. nucleus and protonse. only protonsf. only neutrons

• Have you completed your log book?

a) Yes

b) No