nguyên tử M và N đều có lớp electron ngoài cùng là lớp M và có tổng số electron Hóa trị là 9 biết m là nguyên tố s, n là phi kim. cho biết M, N thuộc nhóm nào trong bảng tuần hoàn

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.