Group 1 - The Alkali Metals- Group Trends.. What are the Group Trends for the Alkali Metals? The atoms get bigger down Group 1 Alkali Metals (as more electron shells are added, see data table below) Generally the density increases down Group 1 Alkali Metals (see data table below), although the atom gets bigger, there is a greater proportional increase in the atomic mass (see data table). Gravity. Density : Densities are quite low and increases from Li to Cs. Group 1- Alkali Metals. The alkali metals are shiny, soft, highly reactive metals at standard temperature and pressure. Group (1 & 2) belong to the s-block of the Periodic Table. As a result, the density of alkali metals increases from Li to Cs. Do Group 1 metals have a high density? Group 1 elements: Trend of change in the physical properties: The atomic radius (atomic size) of alkali metals increases gradually . Advantages about low density alkali metals ? What are Group 1 Elements? Progressing down group 1, the atomic radius increases due to the extra shell of electrons for each element. The Group 1 metals are lithium, sodium, potassium, rubidium, caesium and francium. Atomic and ionic radii, volume : Atomic and ionic radii increases from Li to Fr due to presence of extra shell of electrons. For example, we can predict that francium will have a melting point around 20⁰C and a density of just over 2g/cm³. All the metals react with gases in the air. However, group 1 of the periodic table contains hydrogen, which is a nonmetal.Transition metals, on the other hand, are d … Group 1 elements are chemical elements having an unpaired electron in the outermost s orbital. The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). Which alkali metal has the highest density? Trends in boiling/melting point for alkali metals. Therefore, if we decide to cut these metals, we will be able to do so, without much trouble. The key difference between group 1 metals and transition metals is that group 1 metals form colourless compounds, whereas transition metals form colourful compounds.. Group 1 metals are also known as alkali metals because these elements can form alkaline compounds. Have lower melting points and boiling points.. 2. Lithium, sodium and potassium (group 1) have the lowest densities – less than 1 g/cm 3, which means they float on water. As a group the alkali metals are the least electronegative of the elements, ranging from 0.7 to 1.0 on the scale, while the alkaline earths, the next group on the table, have electronegativities ranging from about 0.9 to 1.5. Reactions of the Alkali Metals with air or oxygen. In keeping with overall periodic trends, the atomic and ionic radii increase smoothly from Li to Cs, and the first ionization energies decrease as the atoms become larger. PLAY. Lithium is said to be the least dense solid in the entire periodic table and their Cohesive Energies are also very low. Density. down the group.. Reason: The number of shells occupied with electrons increases down the group. Which element in Group 1 has the highest density? Transition Metals vs. Group 1 Boiling Points Quiz... Group 1 = G | Transition = T Higher melting point [ ] Lower melting point [ ] Higher density [ ] Lower density [ ] Stronger [ ] Weaker [ ] Harder [ ] Softer [ ] Colours of compounds More reactive [ ] Less reactive [ ] Produces This trend is shown in the figure below: The metals in this series are relatively light— lithium, sodium, and potassium are less dense than water (less than 1 g cm-3). On going down the group, both the atomic size and atomic mass increase but the increase in atomic mass compensates the bigger atomic size. Larger the size larger is the density because there is large increase in mass with considerable increases in volume. 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