Going down group 1 from top to bottom the elements display the following trends: (a) Atomic radius increases. (b) First ionization energy decreases. (c) Second ionization energy decreases.Likewise, what is the trend as we go down Group 1?
The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
Also Know, what is the trend for valence electrons in Group 1? Trends in the Number of Valence Electrons
| Group | 1 (IA) | 16 (VIA) |
| Number of valence electrons | 1 | 6 |
| Trend: | lowest number of valence electrons | → |
Also question is, what is the trend in melting points in Group 1?
Trends in melting and boiling points Both the melting and boiling points decrease down the group. When any of the Group 1 metals is melted, the metallic bond is weakened enough for the atoms to move more freely, and is broken completely when the boiling point is reached.
What is the trend in reactivity in Group 1 with water?
The group 1 elements are all soft, reactive metals with low melting points. They react with water to produce an alkaline metal hydroxide solution and hydrogen. Reactivity increases down the group.
Why is Group 1 most reactive?
The most reactive element in group 1 is casesium because as we come from top to bottom, the size of atom is increased in the parallel with the number of electron, so the strength to held the electron decrease, and we know that all alkali metal have one electron in outer most shell so it can be very easy to remove thatWhy does Group 1 have the lowest ionization energy?
The alkali metals have the lowest first ionisation energies in their respective periods of the periodic table because of their low effective nuclear charge and the ability to attain a noble gas configuration by losing just one electron.Which element has the highest ionization energy?
Fluorine
What happens as you go down Group 1?
All group 1 metals have one electron in its outer shell. As we go down the group, the atom gets bigger. Therefore, the attraction between the nucleus and the last electron gets weaker. This makes it easier for the atom to give up the electron which increases its reactivity.What is Group 7 called?
The Group 7 elements are called the halogens. They are placed in the vertical column, second from the right, in the periodic table . Chlorine, bromine and iodine are the three common Group 7 elements. Group 7 elements form salts when they react with metals.Why does the density increase down Group 1?
The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). Atomic radius increases down a group, so the volume of the atoms also increases. Fewer sodium atoms than lithium atoms, therefore, can be packed into a given volume.What are the elements of Group 1 called?
The Group 1 elements in the periodic table are known as the alkali metals. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution.Are halogens metals?
The halogens are a series of non-metal elements from group 17 of the periodic table (formerly VII). The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be considered a halogen.What state is Group 1 at room temperature?
The alkali metals are solids at room temperature (except for hydrogen), but have fairly low melting points: lithium melts at 181ºC, sodium at 98ºC, potassium at 63ºC, rubidium at 39ºC, and cesium at 28ºC.Who discovered halogens?
Davy's name for the element prevailed. However, in 1826, the Swedish chemist Baron Jöns Jacob Berzelius proposed the term "halogen" for the elements fluorine, chlorine, and iodine, which produce a sea-salt-like substance when they form a compound with an alkaline metal.Why do Group 1 metals react with water?
Group 1 elements are called alkali metals because of their ability to displace H2(g) from water and create a basic solution. Alkali metals are also known to react violently and explosively with water. This is because enough heat is given off during the exothermic reaction to ignite the H2(g).Is electronegativity a periodic trend?
Electronegativity increases as you move from left to right across a period on the periodic table. This is because, even though there are the same number of energy levels, there are more positive protons in the nucleus, creating a stronger pull on the negative electrons in the outer shell.Why does boiling point decrease as you go down Group 1?
Generally the melting point of the alkali metals decreases down the group. This is because as the ions get larger the distance between the bonding electrons and the positive nucleus gets larger and reduces the overall attraction between the two. For similar reasons the electronegativity decreases.What are the properties of Group 1?
Group 1 - the alkali metals. The group 1 elements are all soft, reactive metals with low melting points. They react with water to produce an alkaline metal hydroxide solution and hydrogen. Reactivity increases down the group.What happens as you go down Group 7?
The reactivity of Group 7 elements decreases down the group. The electrons in the outer shell move further away from the nucleus as we go down the group and the attraction force between the electrons and the nucleus become weaker and weaker. This weaker attraction in the larger atoms makes it harder to gain electron.Why are Group 7 elements called halogens?
Group 7 elements form salts when they react with metals. The term 'halogen' means 'salt former', which is why Group 7 elements are called halogens. The halogens are so reactive that they cannot exist free in nature.Do Group 1 metals have a high or low density?
There actually are simple Alkali metals have very high reactivity, so the smaller the ionization energy count the more reactive it gets, Alkali metals have the smallest ionization energy being in Group 1 which is why they have low density. 
