Some info: Many chemical properties are determined by the number of valence electrons.
Elements with the same number of valence electrons will have similar properties.

⚠️⚠️Which element has similar properties to lithium? Magnesium and aluminum and beryllium?⚠️⚠️

Explain !!

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

false it is never safe to stand on the top step of a ladder provided it is braced properly.