Công thức hoá học của A là KNO2

Hoá trị của nitrogen trong hợp chất N2O ,NO,NH3,NO2,N2O5 lần lượt là 1,1,1,1,2

 X là:Aluminium là nguyên tố kim loại            

Y là:Silicon là nguyên tố phi kim

X là:Chlorine

1 I really enjoy listening to music.Hoovever, I dont have any standards in genre selection, I like to listen to any kind of music as long as it's good. When I'm happy, I usually listen to cheerful melodies.When I sad,I often listen to lofi songs. Listening to new song is also awersome .You can feel your life is more beautiful thanks to music.

1Reuse means using something again instead of throwing it away.

2Did your school organise a donotion drive last winter

1My mother is fond of going jogging in the moning.                                            
2My sister finds it difficult to lift weights.

3We colected plantic bottles and sent them to the factory.