Write the nuclear symbol and hyphen notation for each of the following isotopes: a. mass number of 28 and atomic number of 14 b. 26 protons and 30 neutrons

Explanation:

Isotopes are types of atoms of same element with same number of protons and electrons but differ in number of neutrons in their nucleus.

Hyphen notation is written as: Elemental Symbol - (Mass number)

Nuclear Symbol :

a. Mass number of 28 and atomic number of 14.

The element with atomic number 14 is Silicon.

The hyphen notation for this given isotope of a silicon  : Si-28.

Nuclear Symbol  :

b. 26 protons and 30 neutrons.

Mass number of element = 26 + 30 = 56

Atomic number of element = number of proton = 26

The element with 26 atomic number is iron.

The hyphen notation for this given isotope of a iron : Fe-56.

Nuclear Symbol  :

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

it is a solid

explanation: