Metals/non-metals etc.
where are transition metals on the periodic table?
the center
where is the atomic radius greatest?
bottom left
what is the definition of electronegativity?
the tendency of an atom in a molecule to attract the shared pair of electrons
As you move from left to right across a period in the periodic table, what generally happens to ionization energy values?
it increases
what are the 2 exceptions to this rule
hydrogen and helium
what are the properties on alkali metals?
(must Get at least 4)
excellent conductors, shiny, soft, highly reactive, low melting point
It tends to get smaller
when you move from left to right what generally happens to the electronegativity values?
it increases
what's the definition of ionization energy?
the energy needed to remove an electron from an atom in the gaseous state
what year was the periodic table first created?
1869
which elements have 8 valence electrons
noble gases
out of lithium, carbon and calcium which one has the highest atomic radius?
Calcium (Ca)
Within a group of the periodic table, how does electronegativity typically change as you go down the group?
it decreases
out of lithium and cesium which has a higher ionization energy?
Lithium
Consider the following chemical reaction:
2A+3B→C+D2A+3B→C+D
You have 4 moles of A and 6 moles of B initially. If the reaction goes to completion:
the percent yield of the reaction is 50%.
what family is oxygen in?
non-metals
Explain the relationship between atomic radius and atomic number within a period of the periodic table?
the atomic radius generally decreases as you move from left to right across the period
out of ruthenium, silicon, and fluorine which has the highest electronegativity?
fluorine (F)
out of bromine and gold which one has a higher ionization energy?
Bromine (Br)
Consider a hypothetical element, Elementium (El), with the following electron configuration in its ground state: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴.
Predict the possible oxidation states of Elementium and explain the reasoning behind your predictions.
Based on the electron configuration provided, propose a likely location for Elementium in the periodic table and justify your choice.
Elementium is likely to be placed in the actinide series of the periodic table, possibly in the same group as elements like uranium and thorium. The filled 4�4f, 5�5d, and 6�6s subshells are characteristic of actinides.
what family is uranium a part of
actinoids
which of the noble gas has the highest atomic radius?
Radon (Rn)
Identify an element that does not follow the typical trend in electronegativity within its period or group?
Polonium (Po), Aluminum (Al), Fluorine (F), Oxygen (O)
Identify an element that does not follow the typical trend in ionization energy within its period or group?
(just 1)
Oxygen (O), Sulfur (S), Noble Gases, Chromium (Cr), Copper (Cu), Nitrogen (N), Beryllium (Be)
Here's a challenging chemistry question that involves multiple concepts and requires critical thinking:
Question:
Consider a hypothetical chemical reaction involving two unknown substances, A and B. The balanced chemical equation for the reaction is:
��+��→��+��aA+bB→cC+dD
Given the initial concentrations of A and B, express the rate of the reaction in terms of the changes in the concentrations of A and B over time (�[�]��dtd[A] and �[�]��dtd[B]).
Derive the rate law for the reaction in terms of the rate constant (�k), the concentrations of A and B, and any other relevant parameters.
If the reaction is determined to be first-order with respect to A and second-order with respect to B, propose a mechanism for the reaction, and explain how the given rate law aligns with the proposed mechanism.
This aligns with the proposed rate law, indicating that the reaction is first-order with respect to A and second-order with respect to B.