Which element is least reactive in group 1A?
lithium (Li)
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.
Which element is the smallest in group 1?
Higher energy electron shells are located further from the nucleus. So the atomic radius generally increases down a group in the periodic table. So the alkali metal that will have the smallest atomic radius is lithium.
Does group 1 have low electronegativity?
A graph showing the electronegativities of the Group 1 elements is shown above. Each of these elements has a very low electronegativity when compared with fluorine, and the electronegativities decrease from lithium to cesium.
What element in period 4 has the lowest mass?
The potassium element in period 4 of the periodic table has the lowest mass.
Which is the least reactive alkali metal?
lithium
Concept: The alkali metals are soft and silvery. They are also the most reactive metals having the lowest ionization energies. They react readily with water, lithium being the least reactive and potassium the most.
Which member is least reactive?
The least reactive elements are those who have a full outermost valence shell ie they have 8 electrons in the outer shell so elements such as helium, neon, radon or the transition elements.
What is the smallest atom in period 4?
The atomic size decreases along the period towards the right but the noble gases are larger than halogens. So the smallest element of the period is the halogen. So, the smallest element of the fourth period is Bromine.
Which type of elements is lowest amount in the periodic table?
Thus, helium is the smallest element, and francium is the largest.
Why does group 1 have the lowest ionization energy?
Reason for decreasing 1st Ionization energy Of group I with radius. As the last electron of the group 1 elements is loosely attached to the nucleus, it’s easy to remove the electron from the atom. That is why the I.E. of the group 1 elements are low.
Why do alkali metals have the lowest ei1?
The valence electrons in alkali metals, are very away from the nucleus. They can easily lose electrons with low energy and become cationic. Hence, they have low ionization energy.
What element is in period 4 group?
The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn)….The Transition Metals.
| 3A | (13) |
|---|---|
| 4A | (14) |
| 5A | (15) |
| 6A | (16) |
Which element in group 1 is least reactive to water?
Lithium
Lithium is the least reactive because it is the one with the least electrons.
What is the least reactive element in the fourth period?
Copper is the least reactive element. In the periodic table, reactivity decreases from left to right and increases from top to bottom. Furthermore, potassium is an alkali metal, calcium is an alkaline earth metal, and copper is a transition metal.
Which atoms are the smallest?
The smallest atom is helium with a radius of 31 pm, while the largest known is caesium at 298 pm. Although hydrogen has a lower atomic number than helium, the calculated radius of the hydrogen atom is about 70% larger.
Which of the following is the lowest atomic number?
The element with the lowest atomic number is hydrogen. Hydrogen has an atomic number of 1, regardless of which hydrogen isotope we have.