Question : Electrons in the highest energy level of an atom are called ________.

Option 1: Valence protons

Option 2: Orbital protons

Option 3: Valence electrons

Option 4: Orbital electrons

Question : An electron microscope gives higher magnifications than an optical microscope because:

Option 1: The velocity of electrons is smaller than that of light.

Option 2: The wavelength of electrons is smaller as compared to the wavelength of visible light.

Option 3: The electrons have more energy than the light particulars.

Option 4: The electron microscope uses more powerful lenses.

Question : Which of the following statements is correct?

Option 1: Atomic radius increases across a period and decreases down a group in the periodic table.

Option 2: Atomic radius decreases across a period and increases down a group in the periodic table.

Option 3: Atomic radius decreases across a period and down a group in the periodic table.

Option 4: Atomic radius increases across a period and increases down a group in the periodic table.

Question : Identify whether the given statements about ionisation energy are correct or incorrect.

Statement A: The ionisation energy of an atom is the amount of energy that is required to remove an electron from a mole of atoms in the gas phase.

Statement B: The ionisation energy increases from top to bottom in groups and decreases from left to right across a period.

Option 1: Both Statements A and B are correct.

Option 2: Only Statement A is correct.

Option 3: Both Statements A and B are incorrect.

Option 4: Only Statement B is correct.

Question : Terrestrial planets are composed of__________.

Option 1: metals and air

Option 2: metals and gas

Option 3: rocks and gas

Option 4: rocks and metals