chm1@ « previous | 2 of 95 next m 2 Groups and periods Learning Goal: To underst

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chm1@ « previous | 2 of 95 next m 2 Groups and periods Learning Goal: To understand the arrangement of the periodic table and identily certain groups of elements by Columns in the periodic table are called groups, and the rows are called periods. Notice that the groups are labeled 1 to 18 and the periods are labeled 1 to 7 Groups 1, 2, and 13 to 18 are caled the main group elements, groups 3 to 12 are the transition elements, and the bottom two rows are called the lanthanides and actinides, respectively. name (e.g halogens, metals, lanthanides etc.) This table gives properties and alternate names for some of the groups The periodic table is a list of elements arranged by atomic number. As you can see in the image Eigure 1) below, the atomic number for each element is the whole number in the cell. The atomic mass, written below the symbol here although it may appear elsewhere in some periodic tables, is the average mass of the isotopes of that element Group Name Properties 1 Alkali metals React to form 1+ ions 2 Alkaline earths React to form 2+ ions 17 Halogens React to form 1 ions Stable and unreactive (Elements Rare gases from other groups fo Rare gases from other groups form ions to 18 Rare noble gases) achieve the same number of electrons as a noble gas ) Metals vs nonmetals Notice the heavy zigzag line running diagonaly across the right part of the table. This line separates metals (below and to the lei of the ine) from, the nonmetals (above and to the right of the line? Metals tendto lose electrons to form positive ions, whereas nonmetals tend to gain electrons to form negative ions Figure 1 D of Part A What is the atomic number of the element located in group 16, period 2 of the periodic table? Enter the atomic number atomic n amber -atomic mass Mints

Explanation / Answer

PART A:

The element located in Group 16, period 2 is Oxygen (O)

PART B:

The charge on element is -1, which is similar to F,Cl,Br and Iodine, hence the element must be placed in group 17 with the halogen family

PART C:

Phosphorus is not a metal

PART D:

Water is not an element since it contains two elements (H) and (O) whereas all other lithium, sulphur and lead contain only one element

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