AnswersDAEP-Science 7 A20 Day TermElements

Nonmetals Answers

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1
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Which element has a complete valence electron shell?

A
selenium (Se)
B
oxygen (O)
C
fluorine (F)
D
argon (Ar)
2
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On the periodic table, the elements known as noble gases are all found in

A
period 2.
B
period 6.
C
group 15.
D
group 18.
3

Looking at the same nonmetal group on the periodic table, how does the reactivity of an element in period 2 compare to the reactivity of an element in period 4?

A
The period 2 element would be more reactive because the attractive force of protons is stronger when there are fewer neutrons interfering.
B
The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.
C
The period 4 element would be more reactive because the attractive force of protons is stronger when there are more neutrons helping.
D
The period 4 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a farther electron shell.
4

A student is working with four different solid substances: sodium (Na), calcium (Ca), copper (Cu), and iodine (I). Which substance is most likely to break easily into many smaller pieces?

A
sodium
B
calcium
C
copper
D
iodine
5

Which compound forms a powerful acid and also contains a halogen?

A
H2S
B
HBr
C
Li2O
D
LiBr
6

What is the most likely reason that nonmetals are electrical insulators?

A
Since valence shells are mostly empty in nonmetal atoms, the atoms attract and hold any electrons they can in order to fill their valence shells.
B
Since valence shells in nonmetal atoms are almost full, the atoms attract electrons and hold them tightly to fill their valence shells.
C
Since all nonmetals have valence shells that are full, they hold electrons tightly to avoid changing.
D
Since all nonmetals have valence shells that are completely empty, they do not attract or release any electrons.
7

Of these nonmetals, which one is likely to be the least reactive?

A
oxygen (O)
B
sulfur (S)
C
chlorine (Cl)
D
fluorine (F)
8

Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements. The table shows other properties that Eriq observed.

Question illustration
A
15.
B
16.
C
17.
D
18.
9

Which describes any compound that has at least one element from group 17?

A
halide
B
noble gas
C
metalloid
D
transition metal
10

Which statement best explains why radon and krypton do not bond easily with other elements?

A
They have many electron shells, so their protons do not attract electrons strongly.
B
They have eight electrons in their valence shells, so they are stable without gaining or losing electrons.
C
Their valence shells are empty, so they do not need to bond with other elements to be more stable.
D
Their valence shells are so close to the protons in the nucleus that bonding cannot happen like in other elements.

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