Practice: Atom and the Periodic Table Vocabulary out terms to mark off that you have used them. Match the terms below to the correct definitions. ? 1. The mass on the periodic table. a. Atom ? _2. Region surrounding the nucleus where electrons are found. b. Electrons ?3 Positively charged center of an atom. c. Protons _4. Particles that differ in number betwoen isotopes. d. Neutrons ? s. Vertical column in the periodic table. e. Electron cloud ? _6. Positively charged particles in an atom. E. Nucleus ? 7. Negatively charged particles in the outermost energy levels of the electron cloud. E Quark &. Table that organizes the elements by properties. h. Atomic number 2 9. Atoms of the same element that have different masses. i. Mass number 10. Smallest known particle that makes up protons and neutrons. j. Average atomic mass ? 11. All elements in the same one of these has the same number of energy levels in their electron cloud. k. Isotopes ? 12. The smallest form of matter that still retains the properties of an element. L. Valence electrons ?_13. Negatively charged particles in an atom. m. Group _? 14. The sum of protons and neutrons in an atom. 15. Represents the identity of an element. n. Period o. Periodie Table

Q: can you please explain answer number 3?

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Q: Problem 1 a through c.

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Quantum mechanics and hydrogen atom

Consider an electron of mass m moves with the velocity v in a hydrogen atom. If an electron is at a distance r from the proton, then the potential energy function of the electron can be written as follows:

Isotopes of Hydrogen Atoms

To understand isotopes, it's easiest to learn the simplest system. Hydrogen, the most basic nucleus, has received a great deal of attention. Several of the results seen in more complex nuclei can be seen in hydrogen isotopes. An isotope is a nucleus of the same atomic number (Z) but a different atomic mass number (A). The number of neutrons present in the nucleus varies with respect to the isotope. 

Mass of Hydrogen Atom

Hydrogen is one of the most fundamental elements on Earth which is colorless, odorless, and a flammable chemical substance. The representation of hydrogen in the periodic table is H. It is mostly found as a diatomic molecule as water H2O on earth. It is also known to be the lightest element and takes its place on Earth up to 0.14 %. There are three isotopes of hydrogen- protium, deuterium, and tritium.  There is a huge abundance of Hydrogen molecules on the earth's surface. The hydrogen isotope tritium has its half-life equal to 12.32 years, through beta decay. In physics, the study of Hydrogen is fundamental.