Table of Contents
What is the trend in reactivity for group 1 elements?
The reactivity of Group 1 elements increases as you go down the group because: the atoms get larger as you go down the group. the outer electron gets further from the nucleus as you go down the group.
What is the trend down group 1?
Group 1 elements are known as Alkali Metals. They are called s-block elements because their highest energy electrons appear in the s subshell. Progressing down group 1, the atomic radius increases due to the extra shell of electrons for each element. Going down the group, the first ionisation energy decreases.
When a group 1 element reacts with water a hydroxide is formed what Colour would universal indicator turn in this solution?
purple
The hydroxides formed in all of these reactions dissolve in water to form alkaline solutions. These solutions turn universal indicator purple, showing they are strongly alkaline. Strong alkalis are corrosive .
What is the trend in the reactivity of alkali and alkaline earth metals as you go from top to bottom of the periodic table?
Instead, they are always found combined with other elements. The reactivity of alkaline Earth metals increases from the top to the bottom of the group. That’s because the atoms get bigger from the top to the bottom, so the valence electrons are farther from the nucleus.
Why does reactivity increase down group1?
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.
Why do group 1 elements react vigorously 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).
Why does reactivity decrease in group 7 but increase in group 1?
This means that the electrons in the outer shell are further away from the nucleus, and so the attraction decreases and it is easier for the atom to lose electron, thus becoming more reactive, as is the case for group 1 (the alkali metals).
Which element is the most reactive element in group 1?
francium
Reactivity of Group 1 Elements The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Because alkali metals are so reactive, they are found in nature only in combination with other elements.
What is the trend as you move from the top to bottom of a group of elements?
From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.
What is the trend for the reactivity of metals?
Metal reactivity decreases from left to right across periods and increases down groups. nonmetallic characteristics increases from left to right and decreases down groups. Nonmetal reactivity increases from left to right and decreases down groups.
Why is group 1 most reactive?
Group 1 of the periodic table includes hydrogen and the alkali metals. Because they have just one valence electron, group 1 elements are very reactive.
Why does reactivity increase down group 1 but decrease down group 17?
Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. This characteristic makes them more reactive than other non-metal groups.
What are the two most reactive elements in group 1?
Group IA is also called the alkali group which includes Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs) and Francium (Fr). 2. The group IA elements are generally soft, reactive metals with low melting points….CBSE PCM (2022-23)
| Ionisation Energy (KJ/mol) | |
|---|---|
| First | 801 |
| Second | 2430 |
| Third | 3660 |
| Fourth | 25000 |
Which statement explains the trend in reactivity of Group 1 elements?
Which statement explains the trend in reactivity of Group 1 elements? [Higher tier only] The number of shells increases, decreasing the forces of attraction – easier to lose the electron, and the reactivity increases
Why do the Group 1 elements have similar properties?
The Group 1 elements have similar properties because of the electronic structure of their atoms – they all have one electron in their outer shell. In a reaction, an atom of a Group 1 element will form an ion with a single positive charge.
How does the number of shells affect the reactivity?
The number of shells increases, decreasing the forces of attraction – harder to lose the electron, and the reactivity increases Which is the correct balanced equation for the reaction of caesium, Cs, with water?