The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element.

Explanation:

5 0

2 years ago

Sita made a model of three parts of the solar system, the Sun, Earth and Moon.

Bumek [7]

She must have used the torch as Sun, the tennis ball as Earth and the marble as Moon.

8 0

2 years ago

GUYS I NEED HELP THIS IS DUE TONIGHT !!!

kenny6666 [7]

Explanation:

To balance the reactions given, we must understand that the principle to follow is the law of conservation of matter.

Based on this premise, the number of moles of species on the reactant and product side must be the same;

Li + Br₂ → LiBr

Put a,b and c as the coefficient of each species

aLi + bBr₂ → cLiBr

balancing Li;

a = c

balancing Br;

2b = c

let a = 1;

c = 1

b = $\frac{1}{2}$

or a = 2, b = 1 , c = 2

2Li + Br₂ → 2LiBr

P + Cl₂ → PCl₃

Using the same method;

aP + bCl₂ → cPCl₃

balancing P;

a = c

balancing Cl;

2b = 3c

let a = 1;

c = 1

b = $\frac{3}{2}$

a = 2, b = 3, c = 2

2P + 3Cl₂ → 2PCl₃

iii,

H₂ + SO₂ → H₂S + H₂O

use coefficients a,b,c and d;

aH₂ + bSO₂ → cH₂S + dH₂O

balancing H;

2a = 2c + 2d

balancing S;

b = c

balancing O

2b = d

let b = 1,

c = 1

d = 2

a = 3

3H₂ + SO₂ → H₂S + 2H₂O

3 0

3 years ago