$CATEGORY: Science - TicTacLearn/4. Structure of the atom/4. Structure of the atom--Atomic Number and Mass Number

//Multiple Choice

What does the atomic number of an element represent?
{
~The total number of protons and neutrons
=The total number of protons in the nucleus
~The mass of the atom
~The number of electrons in an atom
}

The atomic number of an element is denoted by which symbol?
{
~A
~M
=Z
~X
}

What is the atomic number of hydrogen?
{
~6
=1
~12
~8
}

What is the mass number of carbon, which has 6 protons and 6 neutrons?
{
~6
=12
~18
~14
}

What is the mass number of aluminum, which has 13 protons and 14 neutrons?
{
=27
~28
~13
~14
}

The sum of protons and neutrons in the nucleus of an atom is called\:
{
~Atomic number
~Isotope
=Mass number
~Atomic mass
}

Which of the following is true about isotopes?
{
~They have different atomic numbers but the same mass number.
=They have the same atomic number but different mass numbers.
~They have different atomic numbers and different mass numbers.
~They have the same atomic number and mass number.
}

Which of the following is an example of isotopes?
{
~Carbon-12 and Carbon-14
~Oxygen-16 and Oxygen-18
~Chlorine-35 and Chlorine-37
=All of the above
}

What are isotopes of an element?
{
~Atoms with the same number of protons and neutrons
=Atoms with the same number of protons but different number of neutrons
~Atoms with the same number of electrons but different neutrons
~Atoms with different atomic numbers
}

The average mass of an atom of a naturally occurring element is calculated by\:
{
~Considering only the atomic number
=Taking the sum of all isotopic forms of the element
~Taking the average of the atomic masses of all elements
~Considering the mass of only one isotope
}

The atomic species of hydrogen, deuterium, and tritium are examples of\:
{
~Isobars
=Isotopes
~Isomers
~Ions
}

What are atoms with the same mass number but different atomic numbers called?
{
~Isotopes
~Ions
=Isobars
~Isomers
}

The average atomic mass of chlorine is 35.5. What does this suggest?
{
~All chlorine atoms have the same mass number.
~Chlorine has only one isotope.
=Chlorine has isotopes with different mass numbers.
~Chlorine is the lightest element.
}

What do we call the total number of protons and neutrons in the nucleus of an atom?
{
~Atomic mass
~Atomic number
~Nucleon number
=Mass number
}

The mass of an atom is primarily due to\:
{
~Electrons
=Protons and neutrons
~Neutrons only
~Protons only
}

Which of the following pairs are examples of isobars?
{
~Carbon-12 and Oxygen-16
=Calcium-40 and Argon-40
~Hydrogen-1 and Deuterium-2
~Chlorine-35 and Chlorine-37
}

Atoms of different elements having the same mass number are called\:
{
~Isotopes
~Ions
=Isobars
~Isomers
}

How is the average atomic mass of an element determined if it has multiple isotopes?
{
~By adding the atomic masses of all isotopes together
~By multiplying the atomic number by the mass number
=By considering the percentage of each isotope
~By taking the highest mass number
}

What is true about the chemical properties of isotopes?
{
~They are different from each other
=They are the same for all isotopes of an element
~They depend on the number of neutrons
~They change with the mass number
}

Which of the following has the same atomic number but different mass numbers?
{
~Protium, Deuterium, and Tritium
~Chlorine-35 and Chlorine-37
~Carbon-12 and Carbon-14
=All of the above
}

//True or False

The atomic number of an element is the total number of protons in the nucleus.{T}

All atoms of an element have the same atomic number but different mass numbers.{F}

The mass number of an atom is the sum of the number of protons and electrons in its nucleus.{F}

Isotopes of an element have the same atomic number but different numbers of neutrons.{T}

The mass number of an atom is always a whole number.{T}

Protons and neutrons are both located outside the nucleus of an atom.{F}

Chlorine has only one isotope.{F}

The atomic number of carbon is 6.{T}

Isotopes of an element have the same chemical properties but different physical properties.{T}

The atomic number of hydrogen is 12.{F}

The mass number of an atom can be determined by adding the number of protons and neutrons in its nucleus.{T}

The atomic number of an element is denoted by the letter "A."{F}

Atoms with the same atomic number but different mass numbers are called isobars.{F}

The chemical properties of isotopes of the same element are different from each other.{F}

The mass number of an element is the average of the mass numbers of all its isotopes.{F}

The atomic species Protium, Deuterium, and Tritium are examples of isotopes of hydrogen.{T}

Atoms of different elements having the same mass number are called isotopes.{F}

Calcium and argon have the same number of nucleons but different atomic numbers.{T}

The average atomic mass of an element is always a whole number.{F}

An isotope of an element always has the same number of protons but a different number of neutrons.{T}


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