| A | B |
|---|
| The elements in the periodic table are placed in order of their | atomic number ( proton number) |
| The proton number changes by ... as you go across the period | 1 |
| The horizontal rows are called | periods |
| the vertical columns are called | groups |
| the number of e in the outer shell of an atom is | the same as the group number |
| The number of shells in atom tells us ...... | the period the element is found |
| Group 1 elements are called | alkali metals |
| group 7 elements are called | halogens |
| group O (or 8) elements are called | Noble Gases |
| Na atomic number 11 electron pattern is | 2,8,1 |
| Na 2,8,1 is in group no. | group no. 1 |
| Na 2,8,1 is in period .... | 3 |
| Ne atomic number 10 el pattern is | 2,8 |
| Ne 2,8 is found in group ....... | O (or 8) Noble Gases |
| Ar 2,8,8 is a Noble gas because it has | full shells |
| K 2,8,8,1 is in group 1 because | it has 1 e in outer shell |
| C & Si are in the same group because | they have the same number of e in the outer shell |
| C & Si are both in group IV because | they both have 4 e in the outer shell |
| Ca and Sr both form 2+ ions because | they both have 2e in their outer shell |
| K, Na & Li are all in group 1 because | they have 1 e in the outer shells |
| We can tell that Na, Mg and Al are metals because their outer shells contain | 1,2 or 3 electrons |
| If there are 1,2 or 3e in outer shell its usually | a metal |
| If there are more than 3 e in the outer shell the element is a | non metal |
| In the PT metals are found to the | left |
| In the PT non metals are found to the | right |
| C 2,4 is non metal because | it has more than 3 e in its outer shell |
| The halogens include | F,Cl,Br, I |
| I is the symbol for | iodine |
| F is the symbol for | Fluorine |
| Cl is the symbol for | chlorine |
| Na is the symbol for | sodium |
| K is the symbol for | potassium |
| Li is the symbol for | lithium |
| Na forms compounds that contain | ions |
| when Na 2,8,1 forms ions it | loses 1 e from its outer shell |
| When chlorine 2,8,7 forms ions it | 1e is added to its outer shell |
| When Mg 2,8,2 reacts with O 2,6 | 2 e are transferred from the Mg outer shell to O outer shell |
| MgO has a high melting point | because ther strong attractive forces between its ions |
| NaCl conducts electricity when it is | liquid but not solid |
| the bonding in all sodium compounds is | ionic |
| When 2 non metals form a compound its bonding is | covalent |
| examples of covalent compounds are | CO2, CH4, SO2 |
| Examples of ionic compounds are | NaCl, K2O, MgO, MgCl2 |
| The particles in covalent compounds are called | molecules |
| covalent compounds have low melting points because the molecules are | neutral |
| covalent compounds do not conduct electricity | under any conditions |
| Diamond is one form of this element | carbon |
| apart from diamond C exists as | graphite |
| graphite and diamond are examples of | giant molecules |
| Cl2 & O2 are examples of | simple molecules |
| as more shells are added to an atom its size | gets bigger |
