28 Questions
Which of the following blocks are called inner-transition elements?
f-block
What is the atomic radius defined as?
Half the distance between two nuclei of the atoms joined by a single covalent bond or a metallic bond
How do the atomic size and effective nuclear charge of an atom relate?
They are inversely proportional
What are s-block and p-block elements collectively known as?
Representative elements
How many groups are there in the periodic table?
18
What is the name of the system used to name elements?
IUPAC System
What is the reason for the difference in magnitude between van der Waal's radius and covalent radius in noble gases?
Due to the presence of inner 1s electrons
What is the effect of inner 1s electrons on the outer 2s electron in lithium?
They shield the outer 2s electron from the nucleus
Why does the atomic radius increase down a group?
Due to the increase in electron shells occupied
What is the effect of the inner shell electrons on the nuclear charge experienced by the 2s electron in lithium?
They decrease the nuclear charge
What is the trend in atomic radii down a group?
Atomic radii increase down a group
What happens to the nuclear charge when moving down a group in the periodic table?
It increases, but is offset by the screening effect of inner shell electrons
Why does the element at the end of a period have the smallest atomic radius among the elements in the same period?
Because its outermost electrons are experiencing the strongest nuclear attraction
What happens to the atomic radius when a new period begins in the periodic table?
It increases sharply
What is the effect of the inner shell electrons on the nuclear charge when moving down a group in the periodic table?
They screen the nuclear charge very effectively
What is the definition of ionization energy?
The minimum amount of energy required to remove the outermost electron of an isolated gaseous atom
What is the symbol for the ionization energy corresponding to the removal of the first electron from the outermost shell of an atom?
IE1
What is the order of ionization energy for an electron in different shells?
s > p > d > f electrons
What type of electronic configurations are more stable and require more energy for removal of an electron?
Fully filled and half filled configurations
What happens to the ionization energy across a period?
It increases
What is the trend of first ionization enthalpy down a group?
It decreases
Why does the ionization energy decrease sharply when a new period begins?
The element at the beginning of the next period has one extra electron in an outer quantum shell
What is the reason for the stability of noble gases?
They have fully filled subshells
What is the electron configuration of oxygen?
1s2, 2s2, 2px2, 2py1, 2pz1
What is the pattern of successive ionization enthalpies with atomic numbers?
3rd I.E.> 2nd I.E.> 1st I.E.
What is the relationship between atomic radius and first ionization energy?
Atomic radius is inversely proportional to first I.E.
Why is the atomic radius of helium greater than that of hydrogen?
Helium has a lower first I.E. than hydrogen
What can be said about the first ionization enthalpy of an element?
It is inversely proportional to atomic radius
Learn about the structure and organization of the periodic table, including blocks, groups, and periods.
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