Periodic Table of Elements

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Which of the following blocks are called inner-transition elements?

s-block

d-block

f-block (correct)

p-block

What is the atomic radius defined as?

The distance between the nucleus and the innermost electron

Half the distance between two nuclei of the atoms joined by a single covalent bond or a metallic bond (correct)

The distance between the nucleus and the outermost electron

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 directly proportional

They are proportional to the square root of each other

They are unrelated

They are inversely proportional (correct)

What are s-block and p-block elements collectively known as?

Representative elements Signup and view all the answers

How many groups are there in the periodic table?

18 Signup and view all the answers

What is the name of the system used to name elements?

IUPAC System Signup and view all the answers

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 Signup and view all the answers

What is the effect of inner 1s electrons on the outer 2s electron in lithium?

They shield the outer 2s electron from the nucleus Signup and view all the answers

Why does the atomic radius increase down a group?

Due to the increase in electron shells occupied Signup and view all the answers

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 Signup and view all the answers

What is the trend in atomic radii down a group?

Atomic radii increase down a group Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What happens to the atomic radius when a new period begins in the periodic table?

It increases sharply Signup and view all the answers

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 Signup and view all the answers

What is the definition of ionization energy?

The minimum amount of energy required to remove the outermost electron of an isolated gaseous atom Signup and view all the answers

What is the symbol for the ionization energy corresponding to the removal of the first electron from the outermost shell of an atom?

IE1 Signup and view all the answers

What is the order of ionization energy for an electron in different shells?

s > p > d > f electrons Signup and view all the answers

What type of electronic configurations are more stable and require more energy for removal of an electron?

Fully filled and half filled configurations Signup and view all the answers

What happens to the ionization energy across a period?

It increases Signup and view all the answers

What is the trend of first ionization enthalpy down a group?

It decreases Signup and view all the answers

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 Signup and view all the answers

What is the reason for the stability of noble gases?

They have fully filled subshells Signup and view all the answers

What is the electron configuration of oxygen?

1s2, 2s2, 2px2, 2py1, 2pz1 Signup and view all the answers

What is the pattern of successive ionization enthalpies with atomic numbers?

3rd I.E.> 2nd I.E.> 1st I.E. Signup and view all the answers

What is the relationship between atomic radius and first ionization energy?

Atomic radius is inversely proportional to first I.E. Signup and view all the answers

Why is the atomic radius of helium greater than that of hydrogen?

Helium has a lower first I.E. than hydrogen Signup and view all the answers

What can be said about the first ionization enthalpy of an element?

It is inversely proportional to atomic radius Signup and view all the answers