In humans, there are three RAS, three Raf, two MEK, and two MAP proteins.

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#Id: 7744

#XL - Q Biochemistry

An ionic radius is one-half the distance between the nuclei of two ions in an ionic bond.

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#Id: 7743

#XL - Q Biochemistry

A covalent radius is one-half the distance between the nuclei of two identical atoms.

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#Id: 7742

#XL - Q Biochemistry

Atomic radii: The atomic radii of an atom depends on its position in the periodic table.

We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.

All that we can measure is the distance between two nuclei (internuclear distance).

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#Id: 7739

#XL - Q Biochemistry

Atoms are characterised by:

Radius

Ionization energy

Electron affinity

Electronegativity

Metallic character

Oxidation potential

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#Id: 7738

#XL - Q Biochemistry

Which of the following are true for an element?

(i) Atomic number = number of protons + number of electrons

(ii) Mass number = number of protons + number of neutrons

(iii) Atomic number = number of protons = number of neutrons

(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (ii) and (iv)

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#Id: 7737

#XL - Q Biochemistry

Calculate the number of electrons, protons and neutrons in 1 mole of 16^O^-2 ions.