A single atom of an element has 21 neurons 20 electrons and 20 protons which element is it?

What is the distribution of earthquakes and volcanoes over the surface of the earth. are they scattered at random or they concentrated in zones

An oxygen molecule contains a double bond because the two atoms of oxygen share a total of (1) 1 electron (3) 3 electrons (2) 2 electrons (4) 4 electrons

What is collimation?

Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4? A. 1.15 * 10^23 B. 1.84 * 10^24 C. 4.61 * 10^23 D. 7.87 * 10^23

There are two opposing processes that occur in a solution in contact with undissoved solute. These are dissolving ___ a. supersaturation; b. hydration; c. crystallization; d. solvation

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, velocity velocity, height height, position

Which radiation detection device is the best to use for measuring the presence of radiation in large moving objects where constant monitoring is impossible? film badge Geiger counter cloud chamber scintillation counter

Smoke fiilling up a room is diffusion or not

What is the independent and dependent variable for a dry ice experiment

a substance that undergoes a physical change like melting is still the same substance is it true or false