This model of the atom:

Is called the plum pudding model

If the atomic number of an atom is 18 and the atomic mass is 39.9, which is NOT true?

The most common isotope has 40 neutrons

Is the approximate mass of a proton

Which of these is not true about atoms?

Always have Protons, Neutrons, and Electrons

Atoms of the same element ALWAYS:

Have the same number of protons

In the experiment below:

electrons were deflected by the negative plate

Are similar in mass to neutrons

The mass of an electron:

Was discovered in the oil drop experiment, Was discovered by Millikin

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Atoms Review Honors Chem

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Atoms, atomic theory, parts of atom, atomic mass

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Questions 22

Answers

1
Which of these would be a correct symbol for an atom with 12 p, 13 n, and 11 e?
25Mn+
25Mg+
12Mg-
13Al-
2
This model of the atom:
Is called the nuclear model
Was shown to be correct by Rutherford
Is called the plum pudding model
Is called the apple pie model
3
Element X has 2 isotopes. X-105 (105AMU) (80%), X-110 (110. AMU) (20%). Atomic mass of X =?
107.5 amu
215 amu
109 amu
106 amu
4
If X^3- has 10 electrons and 7 neutrons, what is the mass number of X?
7
17
14
20
5
If the atomic number of an atom is 18 and the atomic mass is 39.9, which is NOT true?
The most common isotope has 40 neutrons
It has 18 protons
The atom is Argon
It has 18 electrons in nature
6
An H⁺ atom:
Has an extra electron
Is called an isotope
None of these
Has no electrons
7
The fact that Argon's atomic mass is 39.948 would mean that Argon-39 is ---- than Argon-40.
More common
Less Common
Not enough information
Equally common
8
If 60% of X is X-10 & 40 % is X-20, what's the chance of finding an atom of X with mass=14 amu?
40%
60%
Between 40-60%
0%
9
What element has 69 neutrons and a mass number of 119?
Zirconium
Tin
Rhodium
Thulium
10
What is the atomic mass of X if 80% of X weighs 12.999amu and 20% weighs 14.000 amu?
13.499 amu
26.999 amu
13.001 amu
13.199 amu
11
Potassium-40
Has 40 electrons
Has 40 protons
None of these
Has 40 neutrons
12
1 AMU
Is the approximate mass of a proton
Is 1/12 the mass of a Oxygen-12atom
Is the approximate mass of an electron
Is similar in size to a milligram
13
The average mass of all the isotopes of an element is the:
atomic mass
mass number
atomic number
atomic mass unit
14
The atomic theory that describes what we know about atoms was developed by:
Dalton
Millikin
Thomson
Rutherford
15
This experiment:
Showed that the nucleus of an atom was large
Showed the power of neutrons
Was performed by Rutherford
Showed electrons have almost no mass
16
Which of these is not true about atoms?
Atoms of an element are unique from other elements
They are composed of sub-atomic particles
In compounds,atoms are arranged in specific ratios
Always have Protons, Neutrons, and Electrons
17
Atoms of the same element ALWAYS:
Have the same number of protons
Are completely identical to each other
Have the same number of neutrons
Have the same number of electrons
18
In the experiment below:
Neutrons were discovered
protons were attracted to the positive plate
Protons were deflected by the negative plate
electrons were deflected by the negative plate
19
How many electrons are in Br^-?
36
35
34
80
20
Protons
Are similar in mass to neutrons
Are found in the nucleus with electrons
Are similar in mass to neutrons and electrons
Are similar in mass to electrons
21
The mass of an electron:
Was discovered in the oil drop experiment
Was discovered through the gold foil experiment
Was discovered in the cathode ray tube experiment
Was discovered by Millikin
22
Which of these elements would have the same number of neutrons as Chlorine-34?
35Cl
31P
41Ar
33S

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