An atom has 143 neutrons, 92 protons, and 91 electrons. what element is it?

Explain how thermal energy is transferred through convection.

What is the balanced equation for S8 + O2 →SO3

Classify the outcomes based on whether they are caused by adding or removing a reactant from a chemical reaction. The rate of the forward reaction increases. The rate of the reverse reaction increases. The concentration of products increases.

93 mL of water has a given mass of 93 g. which object was more accurate in determining volume, the graduated cylinder or the beaker? why?

When 0.560 g of na (s) reacts with excess f2 (g) to form naf (s), 13.8 kj of heat is evolved at standard-state conditions. what is the standard enthalpy of formation () of naf (s) ?

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?

The frequency of a given region of the electromagnetic spectrum is more than 3 x 1019 HZ. Note that the speed of light is 2.998 x 108 m/s. Which waves are found in this region? A. gamma rays B. visible light C. microwaves D. radio waves E. x-rays

A farmer uses water to irrigate his potato crops. Which roles of water does this examplify

How was helium first discovered?