Ca, Mg, Be, Fr, Cs, Rb, K, Na, Li, H
Strontium
The relationship between the radius and area of a circle is as follows: Area of circle = 3.14 x Radius x Radius or 22/7 x Radius x Radius
The "corpses" of stars may be white dwarves, neutron stars, or black holes (and perhaps "quark stars", but this is still very speculative). In general, the least massive stars - which also tend to be smaller - will become white dwarves. These are much smaller than "active" stars, but much larger than neutron stars or black holes. The more massive the star, the SMALLER will the white dwarf be - due to the increased gravity. Our Sun has a diameter of 1.4 million kilometers; other stars can be several times smaller, or larger - but a white dwarf only has a diameter of a few thousand kilometers. More massive stars become neutron stars, which have a diameter of 20-30 km - and an immense density, similar to that of an atomic nucleus. The most massive stars end up as black holes. Here, the only "diameter" that can be observed from the outside is that of its event horizon, which is directly proportional to the black hole's mass. A black hole the mass of the Sun would have a Schwarzschild radius (the radius of its event horizon) of about 3 km; therefore its "diameter" would be about 6 km. A black hole a billion times the mass of the Sun would have a Schwarzschild radius of 3 billion kilometers.
Br is the atom with the smallest. K+ is the ion with the smallest radius. In general, the shape with the smallest radius has the smallest diameter
what is the similarities between the ulna and the radius
The radius of strontium is smaller than the radius of rubidium.
For the representative elements (main group elements), atomic radius generally decreases from left to right across a period. Example: B and Fl: Fl has the smaller atomic radius Li and Be: Be has the smaller atomic radius
Strontium
the positive ionic radius is smaller than the neutral atomic radius
Rubidium; the next higher atomic numbered element in the same column of the periodic table always has a higher atomic radius, with some exceptions among transition elements due to the "lanthanide contraction". However, potassium and rubidium are not transition elements.
The atomic radius of chemical elements is expressed in picometers (pm).
Element M can be a choice of 4 elements, Beryllium, Magnesium, Calcium, or Strontium. The element must have an oxidation of +2, which means group 2 elements. The atomic radius of a barium atom is 222pm. Radium has a larger atomic radius that Barium, so that is eliminated, and Barium is the same as Barium so that is also eliminated.
Magnesium isn't smaller than chlorine, it's larger. The atomic radius for magnesium is 145 pm and the atomic radius for chlorine is 79 pm. Both magnesium and chlorine are in the third period of the periodic table. The trend for atomic radius is that the elements generally get smaller as you move from left to right across the table in the same period.
Helium usually is listed with the smallest atomic radius when calculated. Hydrogen however has a smaller van der Waals radius The protium isotope of hydrogen has the smallest nucleus radius. It is 1.6 fm
The atomic radius of bromine is lower.
The positive ionic radius is smaller than the neutral atomic radius
Magnesium's atomic radius is smaller than Calcium's.