Francium
Is the largest alkali metal?
Cesium
is the largest atom among alkali metal.
What is the heaviest alkali metal * Your answer?
Francium
is the heaviest alkali metal in group 1 of the periodic table.
What is the lightest Chalcogen?
Oxygen (O)
is the first element of group 16, therefore it is the lightest chalcogen of its group.
Which is the lightest alkaline earth metal?
The lightest alkaline metal is
beryllium (Be)
with an atomic number of 4 and an atomic mass of 9.012182.
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.
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 radius?
2 Answers.
Sodium
has the larger radius.
Why are 16 groups called chalcogens?
-Group-16 elements are also called chalcogens. They are called so
because most of the copper ores have copper in the form of oxides and sulphides
. They also contain small amounts of selenium and tellurium. … So, group-16 elements are named chalcogens.
Which is the lightest noble gas?
Helium
is the lightest of the noble gases, and the second most abundant element in the universe; the Sun produces hundreds of millions of tonnes of helium every second.
What is the period number of oxygen?
| Group 16 −218.79°C, −361.82°F, 54.36 K | Period 2 −182.962°C, −297.332°F, 90.188 K | Block p 0.001308 | Atomic number 8 15.999 | State at 20°C Gas 16 O |
|---|
Is potassium an alkaline earth metal?
The alkali metals are Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radium (Ra). The alkaline earth metals form oxide in the earth and they are soluble in water. This is the reason they are named so. Hence
potassium is an alkali metal and not an alkaline earth metal
.
Why are they called alkaline earth metals?
The alkaline earth metals are named
after their oxides, the alkaline earths
, whose old-fashioned names were beryllia, magnesia, lime, strontia, and baryta. … “Earth” was a term applied by early chemists to nonmetallic substances that are insoluble in water and resistant to heating—properties shared by these oxides.
Is magnesium an alkaline earth metal?
Group 2A (or IIA) of the periodic table are the
alkaline earth metals
: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A.
What metal 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. Atomic radius decreases as you move across a period from left to right and decreases as you move up a group from bottom to top.
Which is the least metallic element?
Therefore, the least metallic elements are the opposite: the right and uppermost elements on the periodic table. Thus, the elements
Helium, Neon, Fluorine
, and Oxygen are logically the least metallic.
