Hey there!
In hyphenated notation, we have the name of the element, a hyphen, then a number that is the sum of protons and neutrons.
The first isotope has 3 protons and 3 neutrons, so the sum is 6. Its name is lithium-6.
The second isotope has 3 protons and 4 neutrons, so the sum is 7. Its name is lithium-7.
Hope this helps!
The correct answer would be a physical change
The answer is true due to the saponification of the fatty substances on the surface of the skin.
A closed system is completely closed to the outside environment. Every interaction is transmitted inside that closed system.
Answer:
caracterizados por ser malos conductores del calor y la electricidad.
