Why do elements in Groups 1-3 tend to become positively charged?

It's easier to lose a few electrons than to gain many

An atom that has gained or lost an electron

Why does the periodic table often show atomic mass as a decimal?

Different isotopes have different atomic masses

Variant of an element in which neutron number differs

What is ionic bonding?

The attraction of oppositely charged atoms after electron transfer

A pure substance that can be further simplified by chemical means

What are cations and anions?

Cations have a positive charge, while anions have a negative charge

The atomic mass listed on the periodic table will be closest to...

The mass of the most abundant isotope

Number of neutrons + number of protons

The positively charged particle within the nucleus

The uncharged particle within the nucleus

Combination of two or more pure substances that can be physically separated

A pure substance that cannot be broken down chemically

The negatively charged particle around the nucleus

What are the only two exceptions to the Octet Rule, and why?

H and He; they are only big enough for 2 valence electrons

Why is life carbon-based?

Because carbon can share 4 electrons

What is covalent bonding?

The sharing of electrons between atoms

What is the Octet Rule?

Atoms gain or lose electrons to attain 8 valence electrons

The smallest particle possible of an element

The smallest particle possible of a compound

Why are Noble Gases known by that name?

They have satisfied their octet and don't chemically react

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General Chemistry

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Review of the periodic table, elements, compounds, mixtures, atoms, molecules, and subatomic particles.

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Questions 30

Answers

1
How many valence electrons do Group 17 elements need to complete their octet?
4
1
2
3
2
Why do elements in Groups 1-3 tend to become positively charged?
It's easier to lose a few electrons than to gain many
They are radioactive
They are large atoms
They are small atoms
3
What charge does sulfur tend to take when it reacts?
1-
2-
2+
1+
4
What is an ion?
An atom that has gained or lost an electron
An atom that has gained or lost a neutron
An atom that has gained or lost a proton
An atom that has gained or lost a nucleus
5
Why does the periodic table often show atomic mass as a decimal?
Different ions have different atomic numbers
Different ions have different charges
Different isotopes have different charges
Different isotopes have different atomic masses
6
What is an isotope?
Variant of an element in which electron number differs
Variant of an element in which nucleus number differs
Variant of an element in which neutron number differs
Variant of an element in which proton number differs
7
What are valence electrons?
Electrons that are shared or transferred between atoms
The electrons in the outermost shell
Electrons available for chemical bonding
All of the above
8
What is ionic bonding?
The attraction of oppositely charged atoms after electron transfer
A difference in the number of neutrons in the nucleus
The ratio of one element to another in a compound
The sharing of electrons between atoms
9
What is a compound?
A pure substance that cannot be broken down chemically
A pure substance that can be further simplified by chemical means
A heterogeneous mixture
A homogeneous mixture
10
Carbon has an atomic number of 6 and an atomic mass of 12. How many neutrons does it have?
4
5
6
7
11
What are cations and anions?
Cations have a positive charge, while anions have a negative charge
Cations are in the nucleus, while anions are in the electron cloud
Cations are radioactive, while anions are stable
Cations form covalent bonds, while anions form ionic bonds
12
How many valence electrons do Group 2 elements have?
2
3
1
4
13
The atomic mass listed on the periodic table will be closest to...
The mass of the least abundant isotope
The charge of the anion
The charge of the cation
The mass of the most abundant isotope
14
H is in Group 1, while C is in Group 14. What compound can they form?
C2H2
C2H4
CH4
All of the above
15
What is atomic mass?
The number of valence electrons
The number of protons
The number of neutrons
Number of neutrons + number of protons
16
What is a proton?
The smallest particle possible of a compound
The positively charged particle within the nucleus
The smallest particle possible of an element
The negatively charged particle around the nucleus
17
What is a neutron?
The uncharged particle within the nucleus
The negatively charged particle around the nucleus
The smallest particle possible of an element
The positively charged particle within the nucleus
18
What is a mixture?
A pure substance that can be further simplified by chemical means
A pure substance that cannot be broken down chemically
A nuclear reaction
Combination of two or more pure substances that can be physically separated
19
What is an element?
A pure substance that can be further simplified by chemical means
A homogeneous mixture
A heterogeneous mixture
A pure substance that cannot be broken down chemically
20
How many valence electrons does neon have?
7
5
8
6
21
What is an electron?
The negatively charged particle around the nucleus
The smallest particle possible of an element
The positively charged particle within the nucleus
The uncharged particle within the nucleus
22
What are the only two exceptions to the Octet Rule, and why?
F and Cl; they form anions
C and Si; they can form double bonds
Na and K; they form cations
H and He; they are only big enough for 2 valence electrons
23
What is atomic number?
The number of valence electrons
The number of neutrons
Number of neutrons + number of protons
The number of protons
24
Why is life carbon-based?
Because carbon can share 4 electrons
Because carbon is a noble gas
Because carbon is a transition metal
Because carbon has 7 valence electrons
25
Mg has a charge of 2+, while Cl has a charge of 1-. What ionic compound can they form?
Mg2Cl2
MgCl
Mg2Cl
MgCl2
26
What is covalent bonding?
The ratio of one element to another in a compound
The attraction of oppositely charged atoms after electron transfer
The sharing of electrons between atoms
A difference in the number of neutrons in the nucleus
27
What is the Octet Rule?
Atoms always have exactly 8 electrons
Atoms gain or lose electrons to attain 8 valence electrons
Atoms gain or lose neutrons until they're the same as the protons
Atoms never have 8 electrons
28
What is an atom?
The smallest particle possible of a compound
The smallest particle possible of an element
The negatively charged particle around the nucleus
The positively charged particle within the nucleus
29
What is a molecule?
The negatively charged particle around the nucleus
The positively charged particle within the nucleus
The smallest particle possible of an element
The smallest particle possible of a compound
30
Why are Noble Gases known by that name?
They are the most reactive elements
They are the most radioactive elements
They have satisfied their octet and don't chemically react
They are the heaviest elements

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