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5107
facts
5107
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Latest facts first
| # | Question & Answer |
|---|---|
| 4051 |
What is a metallic bond?
-
Bonding in metals where electrons are delocalized and shared collectively in a lattice
|
| 4052 |
Give an example of a covalent compound.
-
Water (H₂O), Methane (CH₄)
|
| 4053 |
What is a covalent bond?
-
Bond formed by sharing of electrons between two atoms
|
| 4054 |
Give an example of an ionic compound.
-
Sodium chloride (NaCl)
|
| 4055 |
What is an ionic bond?
-
Bond formed by transfer of electrons from one atom to another, resulting in cations and anions
|
| 4056 |
What is the octet rule?
-
Atoms tend to gain, lose, or share electrons to have eight electrons in their valence shell
|
| 4057 |
What is valency?
-
Combining capacity of an atom, usually equal to the number of electrons gained, lost, or shared
|
| 4058 |
What are isobars?
-
Atoms of different elements with the same mass number but different atomic numbers
|
| 4059 |
What are isotopes?
-
Atoms of the same element with same number of protons but different number of neutrons
|
| 4060 |
What is the relative charge and mass of a neutron?
-
Charge = 0, Mass ≈ 1.67 × 10⁻²⁷ kg
|
| 4061 |
What is the relative charge and mass of a proton?
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Charge = +1 e, Mass ≈ 1.67 × 10⁻²⁷ kg
|
| 4062 |
What is the relative charge and mass of an electron?
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Charge = -1 e, Mass ≈ 9.11 × 10⁻³¹ kg
|
| 4063 |
What are the three subatomic particles?
-
Electrons (negative), Protons (positive), Neutrons (neutral)
|
| 4064 |
What is Bohr’s contribution to atomic structure?
-
Electrons revolve in fixed orbits with quantized energy levels
|
| 4065 |
Who proposed the Bohr model of the atom?
-
Niels Bohr
|
| 4066 |
What was Rutherford’s model of the atom?
-
Atom has a small, dense positively charged nucleus with electrons orbiting around it
|
| 4067 |
Who discovered the nucleus of an atom?
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Ernest Rutherford
|
| 4068 |
What was Dalton’s contribution to atomic theory?
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Atoms are indivisible, indestructible, and identical for a given element
|
| 4069 |
Who proposed the first atomic theory?
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John Dalton
|
| 4070 |
How does a step-up transformer differ from a step-down transformer?
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Step-up: increases voltage, decreases current; Step-down: decreases voltage, increases current
|
| 4071 |
What is a solenoid used for?
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Creating controlled magnetic fields and as electromagnets
|
| 4072 |
Can Ohm’s law be applied to all conductors?
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No, only for ohmic conductors where resistance remains constant
|
| 4073 |
What is the difference between series and parallel circuits?
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Series: same current, voltage divides; Parallel: same voltage, current divides
|
| 4074 |
How does resistance heating work?
-
Electric current through a high-resistance material produces heat (I²R)
|
| 4075 |
What is the role of electromagnets in practical applications?
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Used in motors, relays, cranes, and MRI machines
|