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Consider the following statements: I. There are 18 group and 8 periods in the periodic table. II. The valency of elements increases from 1 to 4 and then decreases to 0 on moving from left to right in a period. III. Atomic size, electropositive character, metallic character and basic nature of oxides decrease from left to right in a period. IV. In a period, electronegativity and electron affinity decreases from left to right. Which of these is/are correct?

Consider the following statements: I. There are 18 group and 8 periods in the periodic table. II. The valency of elements increases from 1 to 4 and then decreases to 0 on moving from left to right in a period. III. Atomic size, electropositive character, metallic character and basic nature of oxides decrease from left to right in a period. IV. In a period, electronegativity and electron affinity decreases from left to right. Which of these is/are correct? Correct Answer II and III

The correct option is 1, i.e. II and III.

  • There are 18 groups and 7 periods in the periodic table. Hence, statement I is incorrect
  • The valency of elements increases from 1 to 4 and then decreases to 0 on moving from left to right in a period. Hence, statement II is correct.
  •  Atomic size, electropositive character, metallic character and basic nature of oxides decrease from left to right in a period. Hence, statement III is correct.
  • In a period, electronegativity and electron affinity increase from left to right. Hence, statement IV is incorrect.
  • Valency - It is that property of an element that determines the number of other atoms with which an atom of the element can combine.
  • Electropositive implies having a tendency to lose electrons to form positive ions.
  • Electronegative implies having a tendency to gain electrons to form negative ions.
  • Electronegativity is a concept used to describe the tendency of an atom to attract electrons in a covalent bond.

Related Questions

Consider the following statements with reference to the periodic table of chemical elements.
1. Ionization potential gradually decreases along a period.
2. In a group of elements, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decreases as the atomic number increases.
Which of these statement(s) is/are correct?
Consider the following statements with reference to the Periodic Table of chemical element
1. Ionisation potential gradually decreases along a period.
2. In a group of element, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decrease as the atomic number increases.
Which of these statement(s) is/are correct?
Which of the following statements is/are false regarding modern periodic table?
1. Elements in the modern periodic table are arranged in decreasing order of their atomic numbers.
2. Elements in the modern periodic table are arranged in increasing order of their atomic masses.
3. In the modern periodic table, isotopes are placed in adjacent groups.
4. Elements in modern periodic table are arranged in increasing order of their atomic numbers.
Which of the following statement(s) is/are false regarding the modern periodic table? i. In the modern periodic table, the elements are arranged in decreasing order of their atomic numbers. ii. In the modern periodic table, the elements are arranged in increasing order of their atomic masses. iii. In the modern periodic table, isotopes are placed in adjacent groups. iv. In the modern periodic table, the elements are arranged in increasing order of their atomic numbers.
Which of the following is true regarding the metallic nature of minerals? I. Metallic nature is directly proportional to electropositive nature. II. Metallic nature in period increases. III. Metallic nature in groups increases.
Which of the following statements are true regarding the trends in the modern periodic table? i. Atomic radius increases on going right in the periodic table. ii. Ionization energy increases as we go right in the periodic table. iii. Electron affinity increases as we go down in the group.
Which of the following statement (s) is/are Correct? I. Metallic oxides are said to be basic oxides. II. Non-metallic oxides are basic in nature. III. All acids have similar chemical properties.
Which of the following statement(s) is/are correct?
1. Metallic oxides are said to be basic oxides.
2. Non-metallic oxides are basic in nature.
3. All acids have similar chemical properties.
Consider the following statements regarding the Mendeleev periodic table. Identify the correct ones. Elements were arranged in increasing order of atomic weights in horizontal rows called 'groups' and vertical columns called ''periods'. Elements in the same group had the same 'valency' and similar chemical properties.
Which of the following statements is true/false?
1. While moving from left to right in a period, the chemical reaction of the elements first decreases and then increases.
2. Reactivity of non metals increases when moving down the group of the periodic table.