Chemistry
Grade-9
Easy
Question
The total number of known elements to us are:
- 20
- 98
- 108
- 118
Hint:
The periodic table has 118 elements.
The correct answer is: 118
- Element is the simplest substance that cannot be broken further by chemical reaction.
- The modern-day periodic table consists of a total of 118 elements.
- There are 91 naturally occurring elements.
Related Questions to study
Chemistry
A pure substance that cannot be broken down into a simpler substance by a chemical reaction.
A pure substance that cannot be broken down into a simpler substance by a chemical reaction.
ChemistryGrade-9
Chemistry
The smallest particle of any particular type of matter is known by which of the following terms?
The smallest particle of any particular type of matter is known by which of the following terms?
ChemistryGrade-9
Chemistry
The name of the planet which is not taken for naming an element is:
The name of the planet which is not taken for naming an element is:
ChemistryGrade-9
Chemistry
A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?
A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?
ChemistryGrade-9
Chemistry
Identify the scientist whose name is not given for any element?
Identify the scientist whose name is not given for any element?
ChemistryGrade-9
Chemistry
Which of the following is an element?
Which of the following is an element?
ChemistryGrade-9
Chemistry
Which of the compounds shows the highest lattice energy?
Which of the compounds shows the highest lattice energy?
ChemistryGrade-9
Chemistry
They are non-conductors of electricity in solid, molten or aqueous state.
They are non-conductors of electricity in solid, molten or aqueous state.
ChemistryGrade-9
Chemistry
Which of the following is NOT TRUE about covalent compounds?
Which of the following is NOT TRUE about covalent compounds?
ChemistryGrade-9
Chemistry
They are conductors of electricity in solid, molten or aqueous state.
They are conductors of electricity in solid, molten or aqueous state.
ChemistryGrade-9
Chemistry
They have higher enthalpies of fusion and vaporization than molecular compounds.
They have higher enthalpies of fusion and vaporization than molecular compounds.
ChemistryGrade-9
Chemistry
Which of the following is true about lattice energy?
(i) Lattice energy ∝ charge
(ii) Lattice energy ∝ 1/distance
(iii) Lattice energy ∝ hydration energy
Which of the following is true about lattice energy?
(i) Lattice energy ∝ charge
(ii) Lattice energy ∝ 1/distance
(iii) Lattice energy ∝ hydration energy
ChemistryGrade-9
Chemistry
Ionic compounds conduct electricity when dissolved in water. Which statement below best explains the property?
Ionic compounds conduct electricity when dissolved in water. Which statement below best explains the property?
ChemistryGrade-9
Chemistry
What properties does an ionic compound have?
What properties does an ionic compound have?
ChemistryGrade-9
