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جوہر کی ساخت اور جدول دوری
8 سوالات: ایم ڈی کیٹ کیمیا، جوابات اور وضاحت کے ساتھ۔
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How many electrons does a chloride ion (Cl-) have? (Atomic number of chlorine is 17.)
- 1 16
- 2 17
- 3 18
- 4 19
جواب دیکھیں
درست جواب: 18
A chlorine atom has 17 electrons. Gaining one electron to form Cl- gives 18.
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Which element has the highest electronegativity?
- 1 Oxygen
- 2 Chlorine
- 3 Nitrogen
- 4 Fluorine
جواب دیکھیں
درست جواب: Fluorine
Fluorine is the most electronegative element, with a value of about 4.0 on the Pauling scale.
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The electronic configuration 1s2 2s2 2p6 3s2 belongs to:
- 1 Sodium
- 2 Magnesium
- 3 Neon
- 4 Aluminium
جواب دیکھیں
درست جواب: Magnesium
The electrons add up to 12, which is the atomic number of magnesium.
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Which quantum number describes the shape of an orbital?
- 1 Principal quantum number (n)
- 2 Azimuthal quantum number (l)
- 3 Magnetic quantum number (m)
- 4 Spin quantum number (s)
جواب دیکھیں
درست جواب: Azimuthal quantum number (l)
The azimuthal quantum number l sets the shape: l = 0 is s, l = 1 is p, l = 2 is d.
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Across a period from left to right, the atomic radius generally:
- 1 Increases
- 2 Decreases
- 3 Stays the same
- 4 First decreases, then doubles
جواب دیکھیں
درست جواب: Decreases
The nuclear charge rises while electrons are added to the same shell, so the nucleus pulls the electrons in more strongly.
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How many neutrons are in an atom of carbon-14? (Atomic number 6.)
- 1 6
- 2 14
- 3 8
- 4 7
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The sodium ion (Na+) has the same electronic configuration as which noble gas?
- 1 Helium
- 2 Neon
- 3 Argon
- 4 Krypton
جواب دیکھیں
درست جواب: Neon
Sodium has 11 electrons. Na+ has 10, the same as neon.
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What is the maximum number of electrons that a 3d subshell can hold?
- 1 2
- 2 6
- 3 10
- 4 14
جواب دیکھیں
درست جواب: 10
A d subshell has five orbitals and each holds two electrons, so the maximum is 10.