The weighted average of the atomic masses of the naturally occuring isotopes of an element is the A) atomic mass of the element
B) atomic number of the element
C) mass number of each isotope
D) formula mass of each isotope

The weighted average of the atomic masses of the naturally occurring isotopes of an element is the : A) atomic mass of the element.

Isotopes can be defined as two or more forms of a chemical element that contains equal number of protons (atomic number) and electrons but different number of neutrons.

The isotope of any chemical element is denoted by

Where;  

In Chemistry, the atomic mass of a chemical element is weighted average of the atomic masses of the naturally occurring isotopes and its units is u.

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The weighted average of the atomic masses of the naturally occurring isotopes of an element is the

A) atomic mass of the element

Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

So  Isotopes have the same atomic number(the same number of protons and electrons), but different mass numbers (different neutron numbers)

Avg atomic mass = m1.%m1 + m2.%m2mn.%mn

m1 = isotope 1

m2 = isotope 2

% = abundance of the elements in nature

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j