Hello, please can you solve my question: an atom contains 22 protons and 26 neutrons. What is it's mass number?

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The p sub shell can hold up to 8 electrons in an atom. true or false?

Word equation for k(s) +h2o(l) yield koh (aq) + h2

What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume? explain your answer.