How is the number of neutrons in an element found?

Subtract the number of protons from the mass number

Which discoveries of subatomic particles are incorrect?

The electron was discovered by Goldstein in 1886, The proton was discovered by Thomson in 1880, Cathode rays were discovered to be made of protons

Which part of Dalton's hypothesis about atoms is incorrect?

Atoms are indivisible, All atoms of an element are identical

Of the following elements, which have the correct number of protons and electrons?

Cs, 55 protons and 55 electrons

Which theory was included in Dalton's atomic theory?

Atoms of the same element are always identical

What is the nucleus of an atom?

The central core of the atom made of protons and neutrons

Which of the following is true about isotopes of the same element?

Same number of protons, but different mass numbers

Which of the following equal exactly 1 amu?

1/12 of the mass of one carbon-12 atom

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Chemistry I Ch. 4 Review Part 1

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Part 1 of the review for the Chemistry I Chapter 4 Test

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Questions 15

Answers

1
If you split this particle, you no longer have the element in question.
atom
neutron
proton
electron
2
How is the number of neutrons in an element found?
Add the number of protons and electrons
Subtract the number of electrons from the number of protons
Subtract the number of protons from the mass number
Add the mass number and the number of electrons
3
What unit is used to calculate the average atomic mass of an element?
amu
nanogram
kilogram
gram
4
Which discoveries of subatomic particles are incorrect?
The electron was discovered by Goldstein in 1886
The neutron was discovered by Chadwick in 1932
The proton was discovered by Thomson in 1880
Cathode rays were discovered to be made of protons
5
Who discovered the nucleus?
Thompson
Rutherford
Dalton
Democritus
6
Which part of Dalton's hypothesis about atoms is incorrect?
Atoms of the same element have the same number of protons
His whole hypothesis was correct
Atoms are indivisible
All atoms of an element are identical
7
If an element has an atomic number of 84, how many protons & electrons are in the neutral atom?
84 protons and 84 electrons
84 protons and 0 electrons
152 protons and 84 electrons
84 protons and 38 electrons
8
Of the following elements, which have the correct number of protons and electrons?
F, 19 protons and 19 electrons
In, 49 protons and 50 electrons
Zn, 30 protons and 60 electrons
Cs, 55 protons and 55 electrons
9
What is different about isotopes of the same element?
Number of electrons
Atomic numbers
Number of protons
Number of neutrons
10
What do all atoms of the same element have in common?
Their number of protons
Their mass number
Their isotope number
Their number of neutrons
11
Which theory was included in Dalton's atomic theory?
Atoms of different elements combine in one-to-one ratios
Atoms of the same element are always identical
Individual atoms can be seen with a microscope
All atoms of all elements are the same size
12
What does the sum of protons and neutrons in an atom equal?
The atomic charge
The atomic mass
The mass number
The atomic number
13
What is the nucleus of an atom?
Negatively charged with a high density
The central core of the atom made of protons and neutrons
Negatively charged with a low density
Positively charged made up of more protons than neutrons
14
Which of the following is true about isotopes of the same element?
Same number of protons, but different mass numbers
Same number of protons, but different number of electrons
Different number of protons and neutrons
Different number of protons, but same atomic masses
15
Which of the following equal exactly 1 amu?
1/12 of the mass of one carbon-12 atom
The mass of one electron
The mass of one carbon-12 atom
The mass of one helium-4 atom

Chemistry I Ch. 4 Review Part 1 Flashcards | StudBud