$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

Who is credited with the development of the modern periodic table? {
    ~John Newlands
    ~Dmitri Mendeleev
    =Henry Moseley
    ~J.J. Thomson
}

What is the basis of the modern periodic table? {
    ~Increasing atomic mass
    =Increasing atomic number
    ~Similar chemical properties
    ~Electronic configuration
}

How many periods are there in the modern periodic table? {
    =7
    ~8
    ~9
    ~10
}

Which group in the periodic table contains noble gases? {
    ~Group 1
    ~Group 7
    ~Group 8
    =Group 18
}

Which of the following is a property of elements in the same group? {
    ~Same number of protons
    =Same number of valence electrons
    ~Same atomic number
    ~Same atomic size
}

What is the valency of elements in Group 2 of the periodic table? {
    ~1
    =2
    ~3
    ~4
}

Which element is located in Period 3, Group 17 of the periodic table? {
    =Chlorine
    ~Bromine
    ~Fluorine
    ~Iodine
}

What is the trend in atomic size as you move down a group in the periodic table? {
    =Increases
    ~Decreases
    ~Remains the same
    ~First increases, then decreases
}

Which of the following is a characteristic of metals in the periodic table? {
    ~High electronegativity
    ~Poor conductors of heat
    =Malleable and ductile
    ~Brittle
}

What happens to the electronegativity of elements as you move across a period from left to right? {
    =Increases
    ~Decreases
    ~Remains constant
    ~First increases, then decreases
}

//True or False

The modern periodic table is arranged in order of increasing atomic number. {T}

Elements in the same period have the same number of valence electrons. {F}

Group 18 elements are also known as noble gases. {T}

Atomic size decreases as you move down a group in the periodic table. {F}

Elements in Group 1 are called alkali metals. {T}

The element with the atomic number 8 is fluorine. {F}

The electronegativity of elements increases across a period from left to right. {T}

Mendeleev's periodic table was based on increasing atomic numbers. {F}

The element in Period 2, Group 17 is fluorine. {T}

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

//Fill in the blanks

The modern periodic table is based on the increasing ______ of elements.
{
  ~ Atomic mass
  = Atomic number
  ~ Valency
  ~ Density
}

Elements in the same group have the same number of ______ electrons.
{
  ~ Core
  = Valence
  ~ Inner
  ~ Outer
}

The horizontal rows in the periodic table are called ______.
{
  ~ Groups
  = Periods
  ~ Blocks
  ~ Families
}

The first element of Group 1 is ______.
{
  = Hydrogen
  ~ Lithium
  ~ Sodium
  ~ Potassium
}

The elements in Group 18 are also known as ______ gases.
{
  = Noble
  ~ Reactive
  ~ Alkali
  ~ Halogen
}

The number of valence electrons in an oxygen atom is ______.
{
  ~ 2
  ~ 4
  = 6
  ~ 8
}

The element with the atomic number 12 belongs to ______.
{
  ~ Group 1
  = Group 2
  ~ Group 17
  ~ Group 18
}

The atomic size of elements ______ as you move down a group.
{
  = Increases
  ~ Decreases
  ~ Remains constant
  ~ Fluctuates
}

The element with the highest electronegativity is ______.
{
  = Fluorine
  ~ Oxygen
  ~ Chlorine
  ~ Nitrogen
}

The element placed in Period 4, Group 1 is ______.
{
  = Potassium
  ~ Sodium
  ~ Lithium
  ~ Rubidium
}

//Numericals

The modern periodic table is based on the increasing ______ of elements.
{
  ~ Atomic mass
  = Atomic number
  ~ Valency
  ~ Density
}

Elements in the same group have the same number of ______ electrons.
{
  ~ Core
  = Valence
  ~ Inner
  ~ Outer
}

The horizontal rows in the periodic table are called ______.
{
  ~ Groups
  = Periods
  ~ Blocks
  ~ Families
}

The first element of Group 1 is ______.
{
  = Hydrogen
  ~ Lithium
  ~ Sodium
  ~ Potassium
}

The elements in Group 18 are also known as ______ gases.
{
  = Noble
  ~ Reactive
  ~ Alkali
  ~ Halogen
}

The number of valence electrons in an oxygen atom is ______.
{
  ~ 2
  ~ 4
  = 6
  ~ 8
}

The element with the atomic number 12 belongs to ______.
{
  ~ Group 1
  = Group 2
  ~ Group 17
  ~ Group 18
}

The atomic size of elements ______ as you move down a group.
{
  = Increases
  ~ Decreases
  ~ Remains constant
  ~ Fluctuates
}

The element with the highest electronegativity is ______.
{
  = Fluorine
  ~ Oxygen
  ~ Chlorine
  ~ Nitrogen
}

The element placed in Period 4, Group 1 is ______.
{
  = Potassium
  ~ Sodium
  ~ Lithium
  ~ Rubidium
}

The atomic number of an element is 11. How many electrons are present in its outermost shell?
{
  = 1
  ~ 2
  ~ 3
  ~ 8
}

An element belongs to Group 2 and Period 3. What is its atomic number?
{
  = 12
  ~ 13
  ~ 14
  ~ 15
}

The atomic number of an element is 16. What is its electronic configuration?
{
  = 2, 8, 6
  ~ 2, 6, 8
  ~ 2, 8, 8
  ~ 2, 8, 7
}

The atomic radius of an element in Period 3 is 100 pm. What will be the approximate atomic radius of the element directly below it in Period 4?
{
  ~ 100 pm
  ~ 150 pm
  = 200 pm
  ~ 250 pm
}

The atomic mass of magnesium is 24, and its atomic number is 12. How many neutrons are present in its nucleus?
{
  ~ 10
  = 12
  ~ 24
  ~ 36
}

If the atomic number of an element is 17, how many valence electrons does it have?
{
  ~ 5
  ~ 6
  = 7
  ~ 8
}

The atomic number of an element is 19. To which period and group does it belong?
{
  ~ Period 3, Group 1
  = Period 4, Group 1
  ~ Period 4, Group 2
  ~ Period 3, Group 2
}

An element has 20 protons and 20 neutrons. What is its atomic mass?
{
  ~ 20
  = 40
  ~ 60
  ~ 80
}

The atomic number of an element is 15. What is the number of protons, neutrons, and electrons in a neutral atom of this element if its atomic mass is 31?
{
  = 15, 16, 15
  ~ 15, 15, 16
  ~ 16, 15, 15
  ~ 15, 15, 15
}

The atomic radius of an element in Group 1 is 152 pm. What is the expected atomic radius of the element directly below it in Group 1?
{
  ~ 152 pm
  ~ 180 pm
  ~ 200 pm
  = 220 pm
}

//Match the following

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


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