Which is true about the atomic nucleus?

It's the positively charged, dense center of an atom

Select the correct number of subatomic particles.

protons: 19, neutrons: 20, electrons: 19

The glowing of a neon light is caused by electrons emitting energy as they

move from higher to lower energy levels.

The atomic mass of an element is...

a weighted average of the masses of an element's isotopes.

The tendency of an element to react is closely related to...

the number of valence electrons in atoms of the element.

To find the number of neutrons in an atom, you would subtract

atomic number from mass number.

Which of the following is correct for this image

Sodium loses an electron to form a CATION

What can you assume has happened if an electron moves to a higher energy level?

The electron has gained energy.

Which statement about subatomic particles is NOT true?

Protons and neutrons have the same charge.

Atoms of the most reactive elements tend to have

one or seven valence electrons.

The usefulness of Mendeleev's periodic table was confirmed by

the discovery of elements with predicted properties.

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Atoms and the Periodic Table

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Answers

1
Which is true about the atomic nucleus?
It has a neutral charge
The least dense part of the atom
It's the negatively charged, dense center of an atom
It's the positively charged, dense center of an atom
2
Which list of elements contains only metals?
carbon, iodine, tin
iodine, carbon, argon
helium, iron, copper
tin, copper, cesium
3
Select the correct number of subatomic particles.
protons: 19, neutrons: 19, electrons: 19
protons: 39, neutrons: 19, electrons: 19
protons: 20, neutrons: 19, electrons: 20
protons: 19, neutrons: 20, electrons: 19
4
On Sunday in Florida it is illegal for a single woman to....
go shopping
sing karaoke
Skydive
drive a car
5
How many neutrons in the most common isotope of Iron(Fe)?
29
28
30
26
6
The glowing of a neon light is caused by electrons emitting energy as they
colide with other electrons.
move from lower to higher energyy levels.
colide with the nucleus.
move from higher to lower energy levels.
7
The atomic mass of an element is...
a weighted average of the masses of an element's isotopes.
twice the number of protons in one atom of the element.
the sum of the protons and neutrons in one atom of an elment
a ratio based on the mass of a carbon-12 atom.
8
If an atom has 17 protons, 20 neutrons, and 18 electrons, which of the following would be correct?
Chlorine -1 (Cl1-)
Argon -1 (Ar1-)
Argon +1 (Ar1+)
Chlorine +1 (Cl1+)
9
How many neutrons are in the most common isotope of Argon (Ar)
40
21
22
18
10
Which state has the most NCAA tournament teams (March Madness)?
Texas
North Carolina
Florida
California
11
How many electrons are in the following atom?
13
14
10
16
12
Which general statement does NOT apply to metals?
Most metals are ductile.
Most metals are brittle.
Most metals are malleable.
Most metals are good conductors of electric current.
13
What is the mass of an electron?
1 a.m.u
3.14
1/6 x 1023 grams
0 a.m.u.
14
The tendency of an element to react is closely related to...
the number of valence electrons in atoms of the element.
attractions between between its atoms.
the ratio of protons to neutrons in atoms of the element.
its atomic mass.
15
Mendeleev arranged the known chemical elements in a table according to increasing
number of electrons
mass
atomic number
number of protons
16
As you move left to right across a period, the number of valence electrons...
increases and then decreases.
stays the same.
increases.
decreases.
17
To find the number of neutrons in an atom, you would subtract
mass number from atomic number.
isotope number from atomic number.
atomic number from mass number.
atomic number from electron number.
18
Which of the following is correct for this image
Sodium loses an electron to form a CATION
Sodium gains a proton to form an ANION
Sodium gains an electron to form an ANION
Sodium gains a proton to form a CATION
19
What can you assume has happened if an electron moves to a higher energy level?
The atom has become more stable.
The electron has gained energy.
The electron has lost energy.
The atom has lost an electron.
20
Two highly reactive elements in Period 2 are the metal lithium (Li) and the
nonmetal Flourine (F)
nonmetal Neon (Ne)
nonmetal Selenium (Se)
metalloid arsenic (As)
21
Which statement about subatomic particles is NOT true?
Unlike protons and electrons, neutrons have no charge.
Protons and electrons have opposite charges.
Protons and neutrons have the same charge.
Protons and neutrons have almost the same mass.
22
Which of the following is unique for any given element?
the mass of a neutron
the number of neutrons
the number of protons
the charge on the electrons
23
Atoms of the most reactive elements tend to have
one or seven valence electrons.
no valence electrons.
four or five valence electrons.
eight valence electrons.
24
The usefulness of Mendeleev's periodic table was confirmed by
the discovery of the nucleus.
its immediate acceptance by other scientists.
the discovery of elements with predicted properties.
the discovery of subatomic particles.
25
Which element is represented in this image
Carbon (C)
I need more information
Nitrogen (N)
Silicon (Si)

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