LQB186 Study cards 2023 Exam Correct Answers

LQB186 Study cards 2023 Exam Correct Answers What elements make up 96% of living matter - ANSWER carbon, hydrogen, oxygen, nitrogen What is an element? - ANSWER a Substance that contains only ONE type of atom. What are atoms made of? - ANSWER protons, neutrons, electrons Charge of a proton - ANSWER positive charge of electron - ANSWER negative charge of a neutron - ANSWER neutral Where are protons and neutrons located? - ANSWER nucleus of the atom Where are electrons located? - ANSWER outside the nucleus in the electron cloud What does the atomic number represent? - ANSWER number of protons How to determine number of electrons - ANSWER same as protons How to determine the number of neutrons - ANSWER atomic mass - atomic number = neutrons What is a isotope? - ANSWER Element that has same number of protons, different number of nuetrons Example of isotope - ANSWER Carbon 12 and Carbon 14. Carbon 12 What happens to unstable isotopes? - ANSWER They decay (break down) and emit radiation. How do two atoms interact - ANSWER between electron clouds How are electrons arranged? - ANSWER In shells around the nucleus. The first orbit has two electrons, and the following ones have eight What are valence electrons? - ANSWER electrons in the outermost shell