How many electrons are in the element

Number of electrons differ from one elements to other elements .means that each elements have different numbers of electrons

for ex Hydrogen has only one electron whereas helium has 2 electrons

Number of electrons = Atomic number

Atomic number of an element tells the no. of electrons in it.

For ex

Hydrogen ( atomic no. 1 ) 1 electron

helium ( atomic no 2 ) 2 electron

Lithium (atomic no.3 ) 3 electron

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

po-215 i got it right on the quiz