BIOL 1107K Chapter Notes - Chapter 2: Electron Shell, Atomic Number, Mass Number

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15 Jan 2017
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Chapter 2: describe the types of bonds, how they arise, and their relative strengths, describe the unique properties of water, why they occur, and why they are important to living things. Elements: pure substance, only one kind of atom, atomic number. Number of protons: chemical symbol, atomic mass. Average mass number for a sample of an element, when including isotopes: mass number: number of protons and neutrons. Forms of elements with different number of neutrons. Whe(cid:374) (cid:374)eutro(cid:374)s a(cid:374)d proto(cid:374)s do(cid:374)"t (cid:373)at(cid:272)h, they (cid:271)e(cid:272)o(cid:373)e u(cid:374)sta(cid:271)le. Unstable isotopes give off energy in form of radiation. Unit of radioactive decay is the half-life: time required for half of the isotope from to degrade to its stable form. Arou(cid:374)d the (cid:374)u(cid:272)leus (cid:449)ith a(cid:374)other ele(cid:272)tro(cid:374) (cid:271)e(cid:272)ause it"s u(cid:374)sta(cid:271)le. Closer to the nucleus, the more stable (1st orbital) Fill the orbitals closer to the nucleus. We want to know where electrons are so we can explain how chemical reactions will occur.

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