Some isotopes of elements are unstable and decay into other, more stable isotopes over time. for example, it takes 153 years for half of a sample of silicon (si) atoms with 14 protons, 14 electrons, and 18 neutrons to decay. what is the name of this specific silicon isotope?

Silicon-32

Explanation:

Silicon-32 is the isotope of silicon. It's half life is 153 years. It means that it takes 153 years to decay for half of a sample of Silicon atom which has 14 proton, 14 electron and 18 neutrons.

So, answer is Silicon-32.

The name of an isotope will be Silicon-32

Explanation:

Isotopes are those chemical variants of same elements with same number electrons and protons. But differ in number neutrons.

Name of the silicon isotope with:

14 number of protons

14 number of electrons

18 number of neutrons.

Atomic mass of an atom is concentrated in its nucleus which contains protons and neutrons.

Mass of silicon isotope= Number of neutrons+ number of protons

18 + 14 = 32 amu

The name of an isotope will be Silicon-32

it would be kevlar ^^

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.