A, B là 2 nguyên tố thuộc nhóm IA và 2 chu kì liên tiếp. Cho 5,65g hỗn hợp A, B vào nước dư. Sau phản ứng hoàn toàn được 3,92 l H2(đktc). Xác định A, B, tính % khối lượng muối trong kim loại hỗn hợp

i think it is d. e because the next one is igneous.

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: