An element's atomic number is 81. How many protons would an atom of this element have? protons

What defines endothermic reactions and exothermic reactions? Select all that apply. A) Endothermic reactions are chemical reactions that absorb energy from the surrounding environment.

One method of experimentally determining whether a species is paramagnetic is to weigh it in an instrument called a magnetic susceptibility balance. This is a balance with a strong electromagnet placed next to the sample holder.

In the wave-mechanical model of the atom, orbitals are regions of the most probable locations of (1) protons (3) neutrons (2) positrons (4) electrons

Formulae for decomposition of alumium oxide?

How is the nucleus of an atom split? radioactive decay chemical reaction collision of atoms collision with a high-speed particle

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Why can't we breathe in pure oxygen for long

In warm water conditions, female offspring hatch from eggs laid by painted turtles. Male offspring are produced under cold conditions.

It takes 53.0 J to raise the temperature of an 11.0 g piece of unknown metal from 13.0∘C to 24.2 ∘ c. What is the specific heat for the metal?

What happens to the velocity of a sound wave in air if the temperature of the air increases