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Egyptian American International School Science Department Grade 9 – Guided reading A guided tour of the periodic table 1 The periodic table groups ………………………………. elements together. This organization makes it easier to predict the ……………………………….. of an element based on ……………………. They are in the periodic table. In the periodic table, elements are represented by their ……………………………. And are arranged in a certain order. The order is based on ……………………………………………………………………………………………….. The periodic law states that ……………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………....................................... Horizontal rows in the periodic table are called ………………………………. Just as the number of protons an atom has increases by one as you move from left to right across a period, so does ……………………………… ………………………………………… Atoms in the same ……………………………, or column, have the same properties. Why? ……………………………………………………………………………………………………………………………………………………………….. Why are atoms of group 1 elements reactive? ………………………………………………………..…………………………………………………………………………………………………….. What is the process of ionization? ………………………………………………………………………………………………………………………………………………………………. Define: An ion …………………………………………………………………………………………………………………………………………. A cation ………………………………………………………………………………………………………………………………………. An anion ……………………………………………………………………………………………………………………………………… Explain how a lithium atom will react? (Group 1) Explain how a fluorine atom will react? (Group 17) Because the atoms have different structures, they have different …………………………….. What is the atomic number? ………………………………………………………………………………………………….. The atomic number also equals the number of ………………………………………………… The ………………………………………………… for a given element never changes. What is the mass number? ………………………………………………………………………………………..……………. If fluorine has 9 p and 10 n, then the mass number of flurorine = ……………………………………. If oxygen has 8p and 8 n, then the mass number of oxygen = …………………………………. Atoms of an element always have the same atomic number, but they can have different ……………………………………………………… What are isotopes? …………………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………………………………………………. Isotopes of hydrogen: Protium Protons = Electrons = Neutrons = The most common isotopes Protons = Electrons = Neutrons = Also called ……………………………… Tritium Protons = Electrons = Neutrons = ……………………… isotope, so it is found least often. Calculate the number of neutrons for the following isotopes. 35 Cl17 2 Deuterium 37 Cl17 235 U92 Atomic masses are usually expressed in ……………………………. An atomic mass unit (amu) is ………………………………………………………………………………………………………………… Mass of protons = mass of neutrons = …………………….. while electrons have …………………………… mass. The average atomic mass is ………………………………………………………………………………………………………………. ……………………………………………………………………………………………………….. The average atomic mass of chlorine is 35.45 amu. This mass is much closer to ………. amu than to ……….. amu. Why? ………………………………………………………………………………………………………………………….. ………………………………………………………………………………………………………………………………………………………..
