$CATEGORY: Science - Khan Academy/5.Periodic Classification of Elements/5.Periodic Classification of Elements--Making Order Out of Chaos-The Modern Periodic Table

//Multiple Choice

The atomic number of an element is 11. In which group and period is it located?
{
  ~ Group 1, Period 2
  = Group 1, Period 3
  ~ Group 2, Period 3
  ~ Group 17, Period 3
}

An element belongs to Group 17 and Period 2. What is its atomic number?
{
  ~ 7
  ~ 8
  = 9
  ~ 10
}

An element is in Period 4 and Group 2. What is its atomic number?
{
  ~ 12
  = 20
  ~ 24
  ~ 30
}

The atomic number of an element is 17. In which group and period is it located?
{
  ~ Group 16, Period 3
  = Group 17, Period 3
  ~ Group 16, Period 2
  ~ Group 17, Period 4
}

An element has an atomic number of 3. To which group and period does it belong?
{
  ~ Group 1, Period 1
  ~ Group 2, Period 2
  = Group 1, Period 2
  ~ Group 18, Period 2
}

The element in Period 2, Group 14 has an atomic number of ______.
{
  = 6
  ~ 8
  ~ 10
  ~ 14
}

The atomic number of an element is 12. What is its group and period?
{
  ~ Group 1, Period 2
  = Group 2, Period 3
  ~ Group 13, Period 3
  ~ Group 2, Period 2
}

An element belongs to Period 5 and Group 17. What is its atomic number?
{
  ~ 35
  = 53
  ~ 17
  ~ 37
}

An element in Group 1 and Period 4 has an atomic number of ______.
{
  = 19
  ~ 20
  ~ 21
  ~ 22
}

The element with atomic number 10 is in which group and period?
{
  = Group 18, Period 2
  ~ Group 17, Period 2
  ~ Group 18, Period 3
  ~ Group 16, Period 2
}

//True or False

Elements in the same group have the same number of valence electrons. {T}

The atomic size of elements decreases as you move down a group in the periodic table. {F}

Elements in Period 3 have three electron shells. {T}

The element with atomic number 8 belongs to Group 16. {T}

The modern periodic table is arranged in order of increasing atomic mass. {F}

Noble gases are highly reactive elements. {F}

The element with atomic number 12 belongs to Group 2 and Period 3. {T}

Fluorine is the most electronegative element in the periodic table. {T}

Transition metals are found in Groups 3 to 12 of the periodic table. {T}

The valency of an element is determined by the number of protons in its nucleus. {F}

//Fill in the blanks

The element with atomic number 19 is located in the ______ group.
{
  = Group 1
  ~ Group 2
  ~ Group 17
  ~ Group 18
}

An element with electronic configuration 2, 8, 7 belongs to the ______ group.
{
  ~ Group 1
  ~ Group 2
  ~ Group 16
  = Group 17
}

The atomic number of the element in Period 2 and Group 13 is ______.
{
  = 5
  ~ 6
  ~ 10
  ~ 13
}

The element with atomic number 20 is located in ______ period.
{
  ~ Period 2
  ~ Period 3
  = Period 4
  ~ Period 5
}

The number of valence electrons in an element with atomic number 7 is ______.
{
  ~ 2
  ~ 3
  = 5
  ~ 7
}

The element with atomic number 12 belongs to ______ block of the periodic table.
{
  = s-block
  ~ p-block
  ~ d-block
  ~ f-block
}

The element with atomic number 8 belongs to the ______ group.
{
  ~ Group 6
  ~ Group 14
  = Group 16
  ~ Group 18
}

The atomic number of an element in Group 17 and Period 4 is ______.
{
  ~ 9
  ~ 17
  = 35
  ~ 53
}

The element with electronic configuration 2, 8, 2 belongs to the ______ group.
{
  ~ Group 1
  = Group 2
  ~ Group 13
  ~ Group 16
}

The element in Period 3 and Group 15 has the atomic number ______.
{
  = 15
  ~ 16
  ~ 17
  ~ 18
}

//Numericals

The atomic number of an element is 12. What is its electronic configuration?
{
  = 2, 8, 2
  ~ 2, 6, 4
  ~ 2, 8, 6
  ~ 2, 10
}

The atomic mass of an element is 23, and its atomic number is 11. How many neutrons does it have?
{
  ~ 11
  = 12
  ~ 23
  ~ 34
}

An element belongs to Group 17 and Period 3. What is its atomic number?
{
  ~ 9
  = 17
  ~ 18
  ~ 35
}

The atomic number of an element is 20. How many valence electrons does it have?
{
  ~ 1
  = 2
  ~ 3
  ~ 8
}

An element has an atomic number of 7. What is its group number?
{
  ~ 5
  ~ 6
  ~ 7
  = 15
}

The atomic radius of an element in Period 2 is 70 pm. What will be the approximate atomic radius of the element directly below it in Period 3?
{
  ~ 70 pm
  ~ 100 pm
  = 140 pm
  ~ 200 pm
}

An element has 19 protons, 19 electrons, and 20 neutrons. What is its atomic mass?
{
  ~ 19
  ~ 20
  = 39
  ~ 40
}

An element in Period 4 and Group 1 has an atomic number of ______.
{
  ~ 11
  = 19
  ~ 20
  ~ 21
}

The atomic number of an element is 16. How many electrons are present in its outermost shell?
{
  ~ 2
  ~ 4
  = 6
  ~ 8
}

The element with atomic number 10 belongs to which group and period?
{
  ~ Group 18, Period 1
  ~ Group 17, Period 2
  = Group 18, Period 2
  ~ Group 16, Period 2
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
  = Group 1 elements -> Alkali metals
  = Group 2 elements -> Alkaline earth metals
  = Group 17 elements -> Halogens
  = Group 18 elements -> Noble gases
}


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