Q: The atomic number of element Unq is:

The atomic number of element \$Unq\$ is \$104\$. Its name is Unnilquadium. Its IUPAC official name is Rutherfordium. Its IUPAC symbol is \$Rf\$.

Q: The number of elements known in Mendeleev's presented periodic table is:

In Mendeleev’s periodic table, elements were placed based on the atomic mass, and chemical properties. During Mendeleev’s work, only 63 elements were found. After studying the properties of all elements, he found that the properties of elements were related to atomic mass.Hence, correct option is C.

Q: Total number of groups in Mendeleev's table are:

Mendeleev’s periodic table is based on atomic masses. The elements in his periodic table are arranged in increasing order of their atomic masses. Elements with similar properties were placed directly one after another.There are a total of 8 groups and 7 periods in Mendeleev's periodic table.Hence, the correct option is A.

Q: Which of the following compound has no existence?

\$He\$ has electronic configuration of \$1{s}^{2}\$ so it cannot form four bond. Therefore \$HeF_4\$ cannot exists.

Q: Which pair of elements of atomic numbers given below will have similar chemical properties?

The elements with the atomic number \$3\$ and \$11\$ have the same properties because both elements have same valence shell configuration, i.e., \$ns^1\$.

Question 1

Statement: Rows in the periodic table are called periods.State whether the given statement is true or false.

Accepted Answer

After arranging the elements in a row that is elements whose all valence electrons go into the same valence shell they are called periods in the modern periodic table.Hence, the given statement is $\text{true}$

Question 2

Fluorine has highest electron affinity in the periodic table.

Accepted Answer

Electron affinity of fluorine is less than chlorine because the atomic size of fluorine is very less than chlorine as a results there is a large electronic repulsions between the electrons of fluorine. Hence, in fluorine atom the incoming electron experiences lesser attractions towards the nucleus than in chlorine atom.

Question 3

Diagonal relationship is shown by :

Accepted Answer

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Question 4

The atomic number of element Unq is:

Accepted Answer

The atomic number of element $Unq$ is $104$. Its name is Unnilquadium. Its IUPAC official name is Rutherfordium. Its IUPAC symbol is $Rf$.

Question 5

The number of elements known in Mendeleev's presented periodic table is:

Accepted Answer

In Mendeleev&#8217;s periodic&#10;table, elements were placed based on the atomic mass, and chemical&#10;properties. During Mendeleev&#8217;s work, only 63 elements were found. After&#10;studying the properties of all elements, he found that the properties of&#10;elements were related to atomic mass.Hence, correct option is C.

Question 6

Total number of groups in Mendeleev's table are:

Accepted Answer

Mendeleev&#8217;s periodic table is based on atomic masses. The elements in his periodic table are arranged in increasing order of their atomic masses. Elements with similar properties were placed directly one after another.There are a total of 8 groups and 7 periods in Mendeleev's periodic table.Hence, the correct option is A.

Question 7

The magnitude of electron affinity depends upon :

Accepted Answer

The magnitude of electron affinity depends upon the nuclear charge. The halogens, which are one electron short of a completely filled outer subshell have the greatest attraction for an electron.The greater the attraction for the electron, the more exothermic the process.

Question 8

If an element X is placed in group 14, the formula its chloride is:

Accepted Answer

As it is in group 14 it will have 4 electrons in the outer most shell. Hence it can share 4 electrons with 4 chlorine's because each chlorine can share only one electron. $XCl_{4}$ it forms this compound. Here as we mentioned that it shares because it cannot donate or accept 4 electrons rather than sharing is far better than that. Hence it is a covalent bond.

Question 9

Which of the following compound has no existence?

Accepted Answer

$He$ has electronic configuration of $1{s}^{2}$ so it cannot form four bond. Therefore $HeF_4$ cannot exists.

Question 10

Which pair of elements of atomic numbers given below will have similar chemical properties?

Accepted Answer

The elements with the atomic number $3$ and $11$ have the same properties because both elements have same valence shell configuration, i.e., $ns^1$.

Classification Of Elements And Periodicity In Properties

Chemistry
8657 Views

Statement: Rows in the periodic table are called periods.

State whether the given statement is true or false.

Fluorine has highest electron affinity in the periodic table.

Diagonal relationship is shown by :

The atomic number of element Unq is:

The number of elements known in Mendeleev's presented periodic table is:

Total number of groups in Mendeleev's table are:

The magnitude of electron affinity depends upon :

If an element X is placed in group 14, the formula its chloride is:

Which of the following compound has no existence?

Which pair of elements of atomic numbers given below will have similar chemical properties?

Classification Of Elements And Periodicity In Properties

Chemistry 8657 Views

Statement: Rows in the periodic table are called periods. State whether the given statement is true or false.

Fluorine has highest electron affinity in the periodic table.

Diagonal relationship is shown by :

The atomic number of element Unq is:

The number of elements known in Mendeleev's presented periodic table is:

Total number of groups in Mendeleev's table are:

The magnitude of electron affinity depends upon :

If an element X is placed in group 14, the formula its chloride is:

Which of the following compound has no existence?

Which pair of elements of atomic numbers given below will have similar chemical properties?

Chemistry
8657 Views

Statement: Rows in the periodic table are called periods.

State whether the given statement is true or false.