In the nucleus of an atom, there are 18 protons and 20 neutrons. What are the atomic number and mass number of this isotope?

If two electrons in the same atom have the same four quantum numbers, then they must have the same energy. A) true B) false C) They cannot both have the same four quantum numbers.

During a test, what can a student use to identify what type and how many atoms are in a chemical compound? common names chemical names the International Union of Pure and Applied Chemistry the National Chemistry Society

Dados los vectores a ⃗=6m y b ⃗=8m encontrar su resultante cuando Forman ángulo recto de 90° Son paralelos de igual sentido Son paralelos de sentido contrario

Wavelength is 625 nm what is the frequency?

A volleyball player hit a ball with a mass of 0.25 kg. The average acceleration of the ball was 15.5 m/s². How much force did the volleyball player apply to the ball? A. 3.87 m/s² B. 62.0 m/s² C. 3.87 N D. 62.0 N

A number of food chains linked together

Inside a stereo speaker, you will find two permanent magnets: one on the cone and one near the cone. True of false?

When a hurricane nears land what causes the most damage

Calculate if an electric hair dryer uses 2,400 j of energy in 2 s, what is its power?

Which of the following choices best represents a potential stressor?