$CATEGORY: Science - TicTacLearn/4. Structure of the atom/4. Structure of the atom--How are electrons distributed in different orbits(shells)?

//Multiple Choice
Which of the following elements has a valency of 1?
{
~Magnesium
=Hydrogen
~Aluminium
~Calcium
}

The maximum number of electrons in an atom's outermost shell is\:
{
~4
=8
~18
~32
}

An atom with 3 electrons in its outermost shell will have a valency of\:
{
~1
~2
=3
~4
}

Which element has a completely filled outermost shell with 2 electrons?
{
=Helium
~Neon
~Oxygen
~Fluorine
}

The combining capacity of an atom is also known as its\:
{
~Mass number
~Atomic number
=Valency
~Electron affinity
}

How do atoms of elements achieve a full outermost shell?
{
~By gaining protons
=By gaining or losing electrons
~By losing neutrons
~By splitting atoms
}

What is the number of electrons that magnesium (Mg) loses to achieve a stable configuration?
{
~1
=2
~3
~4
}

What does it mean for an atom to possess an "octet" in its outermost shell?
{
~It has 4 electrons in its outer shell.
=It has 8 electrons in its outer shell.
~It has no electrons in its outer shell.
~It has 10 electrons in its outer shell.
}

Which of the following is true about the outermost shell of an atom?
{
~It can hold a maximum of 2 electrons.
=It can hold a maximum of 8 electrons.
~It can hold a maximum of 18 electrons.
~It can hold an unlimited number of electrons.
}

If an atom has 4 electrons in its outermost shell, what will be its valency?
{
~1
~2
=4
~8
}

What is the electron configuration of Neon (Ne), which has 10 electrons?
{
=2, 8
~2, 2, 6
~2, 6, 2
~2, 4, 4
}

Which of the following elements has a valency of 0?
{
~Sodium
~Oxygen
=Helium
~Fluorine
}

What happens to the chemical reactivity of elements that have a full outermost shell (octet)?
{
~They become highly reactive.
=They remain stable and show little chemical reactivity.
~They lose electrons easily.
~They form bonds only with similar atoms.
}

What is the valency of Sodium, which has 1 electron in its outermost shell?
{
=1
~2
~3
~4
}

Which element has 7 electrons in its outermost shell and a valency of 1?
{
~Oxygen
~Nitrogen
=Fluorine
~Chlorine
}

Which of the following elements will have a valency of 2 due to having 2 electrons in its outermost shell?
{
=Magnesium
~Sodium
~Potassium
~Chlorine
}

//True or False

The maximum number of electrons that can be accommodated in the first orbit (K shell) is 8. {F}

The valency of an element is determined by the number of electrons in its outermost shell. {T}

The outermost shell of an atom can hold a maximum of 18 electrons. {F}

Atoms of elements with a full outermost shell are highly reactive. {F}

The number of electrons that an atom can gain, lose, or share is its valency. {T}

Atoms of elements with a completely filled outermost shell show little chemical activity. {T}

The valency of sodium (Na) is 1, as it has 1 electron in its outermost shell. {T}

An atom with 2 electrons in its outermost shell will have a valency of 2. {T}

The combining capacity of an element is determined by the number of neutrons in its nucleus. {F}

Magnesium has 2 electrons in its outermost shell and a valency of 2. {T}

Fluorine has 7 electrons in its outermost shell and a valency of 7. {F}

The outermost shell of an atom is called the valence shell, and the electrons in this shell are called valence electrons. {T}

The shells are filled in a step wise manner. {T}

//Match the Following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Element with a full outermost shell -> Inert and less reactive
=Aluminum -> Valency 3
=Lithium -> Valency 1
=Helium atom -> Inert without octet
=Tendency to react -> To attain a fully-filled outermost shell.
}

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