Which of the following statements about the periodic table is false? a. A series of ions that are isoelectronic must have the same electron configuration.
b. It takes more energy to remove an electron from lithium than from cesium
because the valence electrons
in lithium are located closer to the nucleus.
c. The atomic size of the elements increases going across a period from left to right because the number of
electrons increases, so they are located further from the nucleus.
d. Fluorine is the most electronegative element due to its size and nuclear charge.
e. Elements in the same column have similar reactivities because their valence electrons tend to be located
in the same types of orbitals.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.