The exposure of a person to colloids majorly present in industrial area may results in the accumulation in the body tissue which causes dark deposit in the skin. They are not safe and is dangerous for health which may cause turning of skin blue permanently and it is life long.
Whereas, the colloid of silver nitrate is used to treat skin burns and ulcers but its overuse may result in adverse effect.
D
A describes liquid, b describes solid, and c describes solid as well. therefore d is the only good answer
Answer:
The nucleus of atom is composed of two subatomic particles that each have charges.
- Protons, which are positively charged particles.
- Neutrons, which are neutrally charged particles.
Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.
Answer: The correct option is:
Explanation:
In balanced chemical equation , mass of the reactants is always equal to the mass of the products.
This is the balanced equation because on both sides number of sodium and bromine atoms are same.
On the reactant side there are two sodium atoms and two bromine atoms
On the product side there are also two sodium atoms and two bromine atoms in NaBr.
Mass of reactants (here 2Na and 
)= Mass of products(here 2NaBr)
2(23u) + 2(79.9u) = 2(23u + 79.9u) = 205 u
