AnswersGA-GSE Physical Science AMetalloids

Metalloids — Unit test Answers

28 verified answers2 views
1
Free Preview

Which have different numbers of electrons?

A
different ions of an element
B
different isotopes of an element
C
the nucleus of an element
D
each of the atoms of an element
2
Free Preview

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

A
0
B
24
C
28
D
52
3

While looking at bromine (Br) on the periodic table, a student needs to find another element with very similar chemical properties but with a different atomic mass. Which best describes the student’s options?

A
There are two possible elements, and they are directly to the left and right of bromine.
B
There are two possible elements, and they are directly above and below bromine.
C
There are many possible elements, and they are all in the same vertical column as bromine.
D
There are many possible elements, and they are all in the same horizontal row as bromine.
4

Where are alkaline earth metals found on the periodic table?

A
Group 1
B
Group 2
C
Groups 3–12
D
Group 17
5

The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?

A
They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
B
They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
C
They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
D
They are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.
6

This is how manganese appears in the periodic table.

Question illustration
A
period symbol of manganese
B
isotope symbol of manganese
C
group symbol of manganese
D
chemical symbol of manganese
7

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

A
The atom has 7 neutrons and 8 protons.
B
The atom has 7 electrons and 8 protons.
C
The atom has 8 neutrons and 7 electrons.
D
The atom has 8 electrons and 7 protons.
8

Isra is analyzing the properties of several samples of elements to find out which sample is a metalloid. Which set of properties most likely belongs only to a metalloid?

A
forms basic compounds and is a solid
B
has a high luster and is very brittle
C
is a gas and has low electrical conductivity
D
is brittle and forms acidic compounds
9

Which is the property of nonmetals to evaporate easily?

A
brittle
B
dense
C
liquid
D
volatile
10

Who was the first chemist to organize elements by atomic number?

A
Johann Wolfgang Döbereiner
B
Antoine Lavoisier
C
Henry Moseley
D
John Newlands
11

Which statement describes the location of most metalloids on the periodic table?

A
The metalloids are located below metals and above nonmetals within a group.
B
The metalloids are located below nonmetals and above metals within a group.
C
The metalloids are located to the right of nonmetals and to the right of metals within a period.
D
The metalloids are located to the left of nonmetals and to the left of metals within a period.
12

The model below shows an atom of an element.

Question illustration
6
6
8
8
9
9
1
16
13

How does Rutherford’s model of the atom compare with Thomson’s model?

A
They both describe atoms as small, indivisible spheres.
B
They both describe electrons as moving around the nucleus.
C
They both describe electrons as being surrounded by the positive matter.
D
They both describe atoms as being made up of positive and negative matter.
14

Which element is most likely to carry electric current easily?

A
tin (Sn)
B
sulfur (S)
C
antimony (Sb)
D
selenium (Se)
15

Which statement describes the relationship between science and society?

A
Science is rarely influenced by the needs of society.
B
Science and society are independent.
C
Science and society have different goals.
D
Scientists find new ways to address societal concerns.
16

Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?

A
calcium, magnesium, strontium
B
magnesium, calcium, strontium
C
strontium, calcium, magnesium
D
strontium, magnesium, calcium
17

Atoms of two different elements must have different

A
electrical charges.
B
numbers of neutrons.
C
atomic numbers.
D
energy levels.
18

Read the passage about the fluoridation of drinking water.Since the early 1960s, fluoride has been added to many sources of drinking water to prevent cavities in teeth. This is called fluoridation. There are some who say that this is unnecessary and increases the risk of cancer.In 1993, the Subcommittee on Health Effects of Ingested Fluoride of the National Research Council, part of the National Academy of Sciences, conducted an extensive study about the link between fluoridated drinking water and increased cancer risk. The study included data from more than 50 human disease studies and six animal studies. The Subcommittee concluded that none of the data showed a link between fluoridated drinking water and cancer. A 1999 report by the CDC supported these findings. The CDC report concluded that studies so far have produced "no credible evidence” of a link between fluoridated drinking water and an increased risk for cancer.

A
There is no link between fluoride exposure and increased cancer risk in humans.
B
There is a possible link between fluoride exposure and increased cancer risk in humans.
C
There is a definite link between fluoride exposure and increased cancer risk in humans and animals.
D
There is a possible link between fluoride exposure and increased cancer risk in animals.
19

Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist’s project and point to sources of error?

A
direct funding
B
peer review
C
conclusive research
D
data collection
20

How does a scientist use creativity?

A
by requiring evidence and thinking logically
B
by taking a closer look at the natural world
C
by asking questions about the natural world
D
by using prior knowledge to solve problems

Did you find these answers helpful?

More from this Course

Quiz
22 verified answers

Unit Test

Quiz
15 verified answers

Unit Test

Quiz
34 verified answers

Unit Test