Based on your understanding of the periodic table, which element has the greatest number of electrons
a. uranium
b. sodium
c. selenium
d. polonium

A. Uranium

Explanation:

Uranium - 92e-

Sodium - 11e-

Selenium - 34e-

Polonium - 84e-

Answer : The uranium element has the greatest number of electrons.

Explanation:

Atomic number : It is defined as the number of protons or number of electrons.

Atomic number = Number of protons = Number of electrons

Mass number : It is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

The given element is, Uranium

Atomic number of Uranium = 92

Atomic number = Number of protons = Number of electrons

So, Atomic number = Number of electrons  = 92

The given element is, Sodium

Atomic number of Sodium = 11

Atomic number = Number of protons = Number of electrons

So, Atomic number = Number of electrons  = 11

The given element is, Selenium

Atomic number of Selenium = 34

Atomic number = Number of protons = Number of electrons

So, Atomic number = Number of electrons  = 34

The given element is, Polonium

Atomic number of Polonium = 84

Atomic number = Number of protons = Number of electrons

So, Atomic number = Number of electrons  = 84

Hence, from this we conclude that uranium element has the greatest number of electrons.

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