- francium. The heaviest of the alkali metals is very rare and radioactive and has a very short life span (about 22 minutes).
- cesium. Rare metal that is used especially in photoelectric cells, atomic clocks, infrared lamps and treating certain cancers.
- rubidium. ...
- potassium. ...
- sodium. ...
- lithium.
Which alkali metal group 1 is the largest?
Unexpectedly, lithium is the strongest reductant, and sodium is the weakest (Table 21.3 “Selected Properties of the Group 1 Elements”). Because Li + is much smaller than the other alkali metal cations, its hydration energy is the highest.
Which alkali metal has the largest atomic size?
Cesium (Cs) , tucked in the lower left hand corner of the table, has the largest known atoms. The atomic radius of Cs is given variously as 273.1 pm [1], 265 pm [2], 265.5 pm [3] or 260 pm [4].
Which alkali metal is the smallest?
Answer: lithium is a alkali metal which is smallest in size.
Are alkali metals soft or hard?
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. They are also relatively soft metals : sodium and potassium can be cut with a butter knife.
Which metal has the largest atomic radius?
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
What has the highest atomic mass?
Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope oganesson-294 have been detected.
What has the smallest atomic radius?
Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.
Is aluminum an alkali metal?
Aluminium is a silvery-white metal, the 13 element in the periodic table. ... These are minerals that combine two sulphuric acids: one based on an alkaline metal (lithium, sodium, potassium rubidium or caesium) and one based on a metal from the third group of the periodic table, primarily aluminium.
Which alkali metal has the lowest atomic mass?
The alkali metals are Xtalt (X), Byyou (By), Chow (Ch) , and Quackzil (Q). Of these metals, Chow has the lowest atomic mass.
Which alkali metal is the strongest reducing agent?
Among all the alkali metals, Lithium (Li) is the strongest reducing agent in aqueous solution.
What is the softest alkali metal?
Potassium is the softest.
Is silver a alkali earth metal?
Elements in this group are called alkaline Earth metals . These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lightweight as alkali metals.
Is silver a alkali metal?
The alkali metals make up Group 1 of the periodic table. This family consists of the elements lithium, sodium, potassium, rubidium, cesium, and francium (Li, Na, K, Rb, Cs, and Fr, respectively). They are all soft, silver metals . ...
Which noble gas has the largest atomic radius?
- Helium (highest ionization level in the periodic table)
- Neon.
- Argon.
- Krypton.
- Xenon.
- Radon.
Which family of elements has the largest radii?
Atomic size INCREASES ACROSS a Period from left to right as we face the Table, and INCREASES DOWN a Group. And thus the largest atomic radius should be exhibited by the alkali metal, francium , or perhaps by lanthanum or actinium.
