SCAN0011 - GENERAL CHEMISTRY REVIEW ATOM The atom has a...

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Unformatted text preview: GENERAL CHEMISTRY REVIEW ATOM The atom has a nucleus and electron cloud. Three subatomic particles : protons, neutrons and electrons The memes "a“ w are in the treatises and _ . 1 : ; _ are in the _ _2 '. We can remove and add electrons but we cannot remove or add protons or neutrons. 13 of protons 2 #- ot electrons in a neutral atom Atomic Number, Z = number of protons in a nucleus = defines the element The number above each element on the periodic table is its atomic number MaSs Number, A = sum of the number of protons and neutrons. Atoms are symbolized in writing, as QX, since the Z is redundant due to the symbol, a symbol of AX suffices. Examples: a) What is the mass number of an iron atom with 30 neutrons? Iron, Fe: 26 is the atomic number, therefore it has 26 protons. @443: Mass number = # of neutrons lus rotons so 26+30 = 56 * 2 - '° p 2.92,»? th>30+.\_:‘-L0LP b) How many protons, neutrons, and electrons are in a 64Zn atom? EH V 64 is the mass number, Zn represents 30 protons. Protons = 30 Electrons = 30 Neutrons =64-30=34 «fl . ififiw,‘ r '14? The Periodic Table {‘5 g: {32, " , ,2, The table is arranged in columns and rows. ’ V 0-,}? :ch > The columns are called groups or families. {fDZ‘P‘Qfl The columns labeled with an A are main group elements. h“ The columns labeled with a B are transition elements. The rows are called periods and are numbered from 1 down to 7. What element is in Group 7A and the third period? (91: What element is in Group IIB and the fifth period? Cd ...
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