What are the trends in the physical and chemical properties of group 7?
The melting points and boiling points of the halogens increase going down group 7, and their colour gets darker. The group 7 elements exist as diatomic molecules . Their chemical formulae are F 2, Cl 2, Br 2 and I 2.
What are the physical properties of group 7?
Properties of the group 7 elements
- Fluorine is a pale yellow gas.
- Chlorine is a poisonous green gas.
- Bromine is a toxic red-brown liquid.
- Iodine is a dark grey solid which gives off a purple vapour when heated.
- Astatine is a black solid.
What are the trends of group 7 elements?
The melting points and boiling points of the halogens increase going down group 7….This is because, going down group 7:
- the molecules become larger.
- the intermolecular forces become stronger.
- more energy is needed to overcome these forces.
What is the trend in state in group 7?
This trend is highlighted by the fact that the physical state of the halogens changes from gaseous (fluorine) to solid (iodine) down the group. Volatility decreases down the group as the boiling points increase. As you go down group 7, the halogens become less reactive.
What is the trend in reactivity in group 7?
Reactivity decreases down the group. This is because group 7 elements react by gaining an electron. As you move down the group, the amount of electron shielding increases, meaning that the electron is less attracted to the nucleus.
What is the trend in Colour in group 7?
Colour. The halogens become darker as you go down the group. Fluorine is very pale yellow, chlorine is yellow-green, and bromine is red-brown. Iodine crystals are shiny purple – but easily turn into a dark purple vapour when they are warmed up.
Why do group 7 elements have different physical states?
Halogens are nonmetals in group 17 (or VII) of the periodic table. Due to increased strength of Van der Waals forces down the group, the boiling points of halogens increase. Therefore, the physical state of the elements down the group changes from gaseous fluorine to solid iodine.
Why do group 7 have similar properties?
Elements in group seven have a number of similar properties, most importantly they have low melting and boiling points. Each element has five electrons in the outer p shell. For each element down the group, we add an extra shell. The result is that each successive element has a larger atomic radii than the one before.
What are the trends in group 1 and 7?
The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group. This is the opposite trend to that seen in the alkali metals in Group 1 of the periodic table . Fluorine is the most reactive element of all in Group 7.
Why are group 7 elements highly reactive?
Group VII A elements are very reactive non metals because they need only one electron to fulfill their noble gas configuration. They will steal electrons from where ever they can to get that configuration. They are also very electronegative due to the increased effective nuclear charge compared to other elements.
Why do group 7 elements have similar properties?
What are group 7 elements called?
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The name “halogen” means “salt former”, derived from the Greek words halo- (“salt”) and -gen (“formation”).
What are the physical properties of Group 7?
This page explores the trends in some atomic and physical properties of the Group 7 elements (the halogens) – fluorine, chlorine, bromine and iodine.
What are the trends of Group 7 elements?
What are the trends of Group 7 elements? 1 So group seven, aka the halogens. 2 From the lowest boiling and melting point to the highest, the group in order is fluorine, chlorine, bromine, iodine and astatine. 3 As you move down the group the halogens become darker in colour. 4 Each element has five electrons in the outer p shell.
Why do Group 7 elements have different physical states?
The halogens show trends in their physical and chemical properties . Why do Group 7 elements have different physical states? The elements fluorine, chlorine, bromine and iodine in this order display an increasing atomic mass.
Where is Group 7 on the periodic table?
Group 7 contains non-metal elements placed in a vertical column on the right of the periodic table. The elements in group 7 are called the halogens. Group 7 is on the right-hand side of the periodic table, next to group 0 The halogens show trends in their physical and chemical properties.