Gap-fill worksheet question Quiz "The Periodic Table and Electronic Structure"

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   15      2      2,7      2,8,1      2,8,7      2,8,8      3      5      7      8      9      alkali metals      argon      atomic      chlorine      electrons      group      halogens      helium      noble gases      period      phosphorus      shell      shells      sodium   
1a. Electrons are arranged around the nucleus in energy levels or .
1b. The 1st shell can have a maximum of electrons, the 2nd shell a maximum of electrons and the 3rd shell a maximum of electrons.
1c. The 19th and 20th electrons go in the 4th .
1d. The electron arrangement, showing the number of in each can be written out in shorthand eg 2,8,6 for the 1st, 2nd and 3rd shells respectively.

2a. Apart from hydrogen and in period 1 of the Periodic Table the last number in the arrangement is equal to the number in the Periodic Table.
2b. The number of shells used containing electrons is equal to the number.
2c. The number of electrons in an atom is equal to the or proton number.

3a. The element (P) has an atomic number of 15 so the atoms have protons or 15 .
3b. The electron arrangement will be 2,8,5. (c) In the Periodic Table it will be a member of Group and it will be the th element along Period .

4a. Fluorine has an atomic number of so the atoms have 9 protons and electrons.
4b. Its electron arrangement is and it belongs to Group on Period .

5a. A reactive metallic element with an electron configuration of is likely to readily form a single positive ion and is a member of the group of the periodic table and is the element .
5b. The element has an electron arrangement of is chemically totally unreactive and belongs to the group of the periodic table.
5c. Atoms of the reactive non-metal have an electron configuration of and readily gain an to form an singly charged negative ion of electron. configuration and belongs to the reactive group of non-metallic elements known as the .