Answers CR Physical Science Sem. 1Atomic Theory

Nonmetals Answers

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Which element is likely to be the most reactive?

bromine (Br)

chlorine (Cl)

fluorine (F)

iodine (I)

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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?

The period 2 element would be more reactive because the attractive force of protons is stronger when there are fewer neutrons interfering.

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.

The period 4 element would be more reactive because the attractive force of protons is stronger when there are more neutrons helping.

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.

Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.

Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.

Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Krypton is a noble gas, so it secretly bonds with every type of element without showing it.

Where are the most reactive nonmetal elements found on the periodic table?

at the top of group 17

at the bottom of group 17

at the top of group 18

at the bottom of group 18

Which element has a complete valence electron shell?

selenium (Se)

oxygen (O)

fluorine (F)

argon (Ar)

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

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.

Since valence shells in nonmetal atoms are almost full, the atoms attract electrons and hold them tightly to fill their valence shells.

Since all nonmetals have valence shells that are full, they hold electrons tightly to avoid changing.

Since all nonmetals have valence shells that are completely empty, they do not attract or release any electrons.

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?

sodium

calcium

copper

iodine

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.

15.

16.

17.

18.

When looking across the periodic table from left to right, which of these groups are the first to contain nonmetals?

group 2

group 7

group 14

group 18

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

halide

noble gas

metalloid

transition metal

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