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Which is not a factor affecting effective nuclear charge?
the number of neutrons
the number of protons
the atomic radius
Screening Effect
The number of orbitals in one principal quantum shell is determined by?
n
2n^2
n^2
n+1
Which of the following correctly describe isotopes?
same physical properties and chemical properties
Differnt physical properties and chemical properties
same neutron no. but different proton and electron no.
same proton and electron no. but different neutron no.
The hydrogen atom does not contain :
Electron
Proton
Neutron
Principal Quantum Shell
Congrats?
In an ionic compound, how many cations are attracted to 1 anion and vice versa?
4
5
6
7
Beryllium has a higher melting point than Magnesium because
it is malleable
magnesiums are inferior
it has a higher charge density
magnesium is less reactive than beryllium
What is the electronic configurations of Cr atoms?
1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1
1s2, 2s2, 2p6, 3s2, 3p6, 3d4, 4s2
1s2, 2s2, 2p6, 3s2, 3p6, 3d6
1s2, 2s2, 2p6, 3s2, 3p6, 3d4, 3f2
Isotopes of the same element have
the same number of protons.
the same number of neutrons.
the same atomic mass
the same number of megatrons.
Aufbau's Principle states that
electrons revolve around protons and neutrons
the lowest energy levels are always filled first.
electrons are lazy.
pigs can fly too
The lower the principal quantum shell,
the taller the electron
the higher the first ionisation energy
the more electricity it has
the more electrons it has
The crystal structure of ionic compounds consists of
a giant 3D ionic lattice
a spherical ionic lattice
floating balls
metal cations in a sea of delocalized electrons
Where will the electrons travel to?
Up
Down
Straight
They will explode before they do
Up down left right middle back KABOOM!
Which of the following are true?
Ionic compounds conduct electricity in all states
Metals conduct electricity in all states
Ionic compounds conduct electricity in solid state ONLY
Metals conduct electricity in solid state ONLY
Why Ionisation Energy decreases slightly from Nitrogen to Oxygen?
Because outermost electrons of O are in a higher subshell
Because 4th electron added to O is opposite spin of the 3rd
Because they are in different principal quantum shell
Because they are in different subshell
The chemical properties of an element depend mainly on
the number of neutrons
the color of the element
the number of protons and electrons
the period of the element (in the periodic table of elements
Ionisation energy (IE) is
the power an ion possesses
a term that does not exist
the number of valence electrons
the energy required to remove 1 mole of electron from atoms
What is the relative mass of proton, neutron and electron respectively?
10, 1, 1/10
1, 10, 1840
1, 1, 1/1840
1840, 1, 1
The electronic configuration of Copper? (29 electrons)
1s2, 2s2, 2p6, 3s2, 3p2, 3d10,4s5
1s2, 2s2, 2p6, 3s2, 3p2, 3d10,4s1
1s2, 2s2, 2p6, 3s2, 3p6, 3d9,4s2
1s2, 2s2, 2p6, 3s2, 3p6, 3d10,4s1
Why Ionisation Energy decreases down the group? (+ is increase, - is decrease)
proton no. +, screening effect and atomic radius + more
proton no. -,screening effect and atomic radius - more
proton no. +, screening effect and atomic radius - more
proton no. -, screening effect and atomic radius + more
What are valence electrons?
The no. of electrons in the outermost principal quantum shel
The no. of electrons in the outermost subshell
The no. of electrons in the outermost orbital
The no. of electrons in an ionic compound
Atoms bond for
fun
stability
more power
more electrons
Why ionic compounds have high melting and boiling points?
They are widely spaced
Electrostatic attraction very strong
They are formed of 2 elements
Heat is required to expand it
How is Bromine-79 and Bromine-81 related?
They are twins.
Bromine-81 has 2 more electrons.
Bromine-79 has more neutrons.
They are isotopes.
What is the trend in the no. of valence electrons?
Metals have many, non-metals have few
Metals have few, non-metals have many
Noble gases have few, other gases have many
Noble gases have many, other gases have few
Why are metals malleable and ductile?
Because they are hard
Because they have + charge
Because delocalized electrons can hold the cations together
Because it contains metal cations
Which of the following metals is the most reactive?
Fr
K
Li
Na
What is the shape of s orbital?
Dumb-bell
Spherical
Circular
Pyramid
Which elements have no paired d-electrons in its ground state?
Vanadium
Iron
Nickel
Zinc
Why chemical reactions only involve electrons?
Because electrons tend to go to another atom
Because electrons are not restricted
Because electrons are light
Because electrons can be shared, given out or taken in
Which of the following is untrue for an ionic compound?
it has ions
it is brittle
the bonds break and the compound explodes upon heating