How many elements have discovered in nature? not only on earth crust but the whole nature.

An occultation occurs when:b. a planet passes between Earth and a star.During an occultation, the planet's disk blocks the light from the star, resulting in a temporary reduction or complete...

Heating Rate Comparison The heating rate of a planet's interior due to radioactive decay is proportional to its volume, which is determined by its radius cubed. Since Mars has a diameter...

a. Surface area of Earth: We'll use the formula $( A = 4 $pi r^2 $) where $( r = 6371 $) km: $[ A_{$text{Earth}} = 4 $times 3.14159 $times (6371)^2 $,...

a) electronic configuration of Mo1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s1b) The ionization energy increases due to the increase in the nuclear charge with an atomic number at the beginning of the series. Gradually, the shielding effect of the added electrons...

a) Si The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%,...

The d-block elements are called transition metals and have valence electrons in d orbitals. The inner transition elements are those who have their last 3 shells incompletely filled. The f...

According to Bronsted-lowry theory acid is a compound that can transfer proton to any other compound. As to reductants and reducing power, it is well known fact that alkaline metals...

In terms of its constituent elements, the mantle is made up of 44.8% oxygen, 21.5% silicon, and 22.8% magnesium.These elements are all bound together in the form of silicate rocks,...

All isotopes of all elements have atomic masses that are essentially whole numbers. The non-integral atomic masses result from averaging the masses of the various isotopes weighted in proportion to...

Molar mass of SnO2 = 213.71 g/molMass of Sn present in one SnO2 molicule = Atomic mass of Sn = 181.71 g/molSo, percentage of Sn by mass in SnO2...