1. how many periods are there in the periodic table? *

1 point

6

7

8

9

2. how many groups are there in the periodic table? *

1 point

15

16

17

18

3. state the number of valence electrons in an atom of sulfur. *

1 point

2

4

6

8

4. state the number of valence electrons in an atom of calcium. *

1 point

2

4

6

8

5. state the number of valence electrons in an atom of chlorine. *

1 point

1

3

5

7

6. state the number of valence electrons in an atom of arsenic. *

1 point

1

3

5

7

7. give the name and symbol for the element that corresponds to atomic number 10. *

1 point

boron, b

nitrogen, n

neon, ne

nickel, ni

8. give the name and symbol for the element that corresponds to atomic number 18. *

1 point

fluorine, fl

argon, ar

arsenic, as

silver, ag

9. give the name and symbol for the element that corresponds to atomic number 36. *

1 point

krypton, kr

potassium, k

palladium, pd

xenon, xe

10. give the name and symbol for the element that corresponds to atomic number 90. *

1 point

titanium, ti

zirconium, zr

thallium, tl

thorium, th

11. which of the following pairs of elements belong to the same period? *

1 point

na and cl

na and li

na and cu

na and ne

12. which of the following pairs of elements belong to the same group? *

1 point

h and he

li and be

c and pb

ga and ge

13. an element found in period 4 would have how many energy levels/shells? *

1 point

three

four

five

six

14. what group number(s) are the transition elements in? *

1 point

group 1

group 2

groups 3-12

group 8

15. why would you expect strontium to be chemically more similar to calcium? *

1 point

they are in the same family/group.

they are in the same period.

they have the same atomic number.

they have the same atomic mass.

16. what is the heaviest noble gas? *

1 point

helium

radon

flourine

astatine

17. what is the heaviest alkaline earth metal? *

1 point

hydrogen

beryllium

francium

radium