What's the atomic number of an atom that has 20 protons and 20 neutrons

Classify N2 as a substance

Microwave ovens emit microwave energy with a wavelength of 12.8 cm. What is the energy of exactly one photon of this microwave radiation?

What is the basic unit for measuring temperature

When the 1,7-diester CH3O2CCH2CH2CH (CH3) CH2CH2CO2CH3 is treated with sodium methoxide and the reaction mixture is subsequently neutralized with acid, what kind of compound is the major organic product

7. How many moles of argon are there in 20.0 L, at 25 degrees Celsius and 96.8 kPa?

Beta particles are emitted from radioactive atom p when it disintegrates spontaneously to form non radioactive atom q. which of these statements is most likely correct about atom p and atom q?

What should I do for the science fair?

Which compounds yield hydrogen ions as the only positive ions in an aqueous solution? (1) H2CO3 and HC2H3O2 (2) H2CO3 and NaHCO3 (3) NH3 and HC2H3O2 (4) NH3 and NaHCO3

4. How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the Internet using keywords such as troposphere, atmospheric layers, and weather changes.

Is the earth older than any of they rock layers