Answer: The carbon atom in Chloroform has
FOUR bonding pair electrons and
ZERO lone pair of electrons.
Explanation: The carbon atom in Chloroform is bonded to three chlorine atoms and one hydrogen atoms through a single bonds. And the carbon is sp³ hybridized. As we know the electronic configuration of carbons is,
Ground State = 1s², 2s², 2p²
Excited State = 1s², 2s¹, 2px¹,2py¹, 2pz¹
As there are four unpaired electrons in excited state which are all involved in bonding with chlorine atoms and hydrogen atom, therefore, no lone pair of electrons are left.
Answer:
A = 55
Explanation:
The atomic number is the number of protons also = the number of electrons, so basically we have 29 neutrons, 26 electrons and 26 protons. Anyway, it's asking the mass number which is the neutrons + the protons, so you just take 29+26 = 55
The English scientist John Dalton were one of the early scientists who paved the way to science, particularly in atomic chemistry. His atomic theory jumpstarted further developments made by J.J Thomson, Rutherford, Bohr, Schrodinger and many more.
Dalton's atomic theory can be summarized in 5 key points:
1. Atoms are tiny, indivisible and indestructible particles of an element.
2. Atoms of different elements vary in size and mass.
3. Atoms of an element are uniform in size and mass.
4. Compounds are formulated by a fixed ratio of individual atoms of elements.
5. Reactions undergo by rearranging the atoms of the reactants to form the products.
From the choices, the acceptable answer would be: <span>The ratio of atoms in a compound is fixed. </span>
Oxygen is the second component of the atmosphere in terms of volume.