Question

question :-

Give reasons:

a) Rutherford selected a gold foil in his alpha particle scattering experiment.
b) An atom is electrically neutral.
c) Noble gases show least reactivity.
d) Ions are more stable than atoms.
e) Na+ has completely filled K and L shells.

Answer 1

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• Rutherford selected a gold foil in his alpha particle scattering experiment.

Answer) Rutherford used gold for his scattering experiment because gold is the most malleable metal and he wanted the thinnest layer as possible. The gold sheet used was around 1000 atoms thick. Therefore, Rutherford selected a Gold foil in his alpha scatttering experiment.

• An atom is electrically neutral.

Answer) An atom is electrically neutral because the overall charge of an atom is zero. ... Protons are positively charged particles, electrons are negatively charged and neutrons are neutral. The overall charge of an atom is zero because the atoms have an equal number of protons and electrons.

• Noble gases show least reactivity.

Answer) Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

• Ions are more stable than atoms.

Answer) Ions are more stable because their valence shell is fulfilled and therefore no sharing or bonding of electrons take place. While atoms do not have fulfilled valance shell and so, Ions are considered more stable. Ions are more stable than atoms.

• Na+ has completely filled K and L shells.

Answer) Normally an atom of sodium has 11 electrons, so according to formula it has 2 electrons in K shell , 8 electrons in L shell and 1 electron in M shell. However Na+ has 10 electrons only, therefore it has 2 electrons in K shell and 8 in L shell. ... Hence it is said ' Na+ has completely filled K and L shells.

Explanation:

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Answer 2

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ᴀɴsᴡᴇʀ ɴᴏ.1

Rutherford selected a gold foil in his alpha particle scattering experiment.

⇝Rutherford used gold for his scattering experiment because gold is the most malleable metal and he wanted the thinnest layer as possible. The gold sheet used was around 1000 atoms thick. Therefore, Rutherford selected a Gold foil in his alpha scatttering experiment.

ᴀɴsᴡᴇʀ ɴᴏ.2

An atom is electrically neutral.

⇝An atom is electrically neutral because the overall charge of an atom is zero. ... Protons are positively charged particles, electrons are negatively charged and neutrons are neutral. The overall charge of an atom is zero because the atoms have an equal number of protons and electrons.

ᴀɴsᴡᴇʀ ɴᴏ.3

Noble gases show least reactivity.

⇝Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

ᴀɴsᴡᴇʀ ɴᴏ.4

Ions are more stable than atoms.

⇝Ions are more stable because their valence shell is fulfilled and therefore no sharing or bonding of electrons take place. While atoms do not have fulfilled valance shell and so, Ions are considered more stable. Ions are more stable than atoms.

ᴀɴsᴡᴇʀ ɴᴏ.5

Na+ has completely filled K and L shells.

⇝Normally an atom of sodium has 11 electrons, so according to formula it has 2 electrons in K shell , 8 electrons in L shell and 1 electron in M shell. However Na+ has 10 electrons only, therefore it has 2 electrons in K shell and 8 in L shell. ... Hence it is said ' Na+ has completely filled K and L shells.

ᴛʜᴀɴᴋs!!