Isotopes have variable numbers of electrons. select the best answer from the choices provided t f

             False: Isotopes have variable number of Neutrons.

                        Isotopes are defined as those atoms of same element which have same number of protons but different number of neutrons hence, isotopes have different number of neutrons and mass number respectively.

Example:

Hydrogen have three Isotopes;

                          i) Protium-1 having 0 neutrons

                          ii) Deuterium-2 having 1 neutron

                          iii) Tritium-3 having 2 neutrons

While, when the number of electrons for a particular atom varies it results in the formation of ions of that atom.

Example:

Hydrogen when looses one electron it converts into H⁺

Nitrogen when gains three electrons it converts into N⁻³

Chlorine when gains one electrons it converts into Cl⁻

Magnesium when looses two electrons it converts into Mg⁺⁺

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.