1) what is the atomic number of iron  a) 26 b) 22 c) 18 2) in which cycle the phosphorus element is located? a) 3 b) 1 c) 5 3) how many types of matter we have? a) 3 b) 4 c) 2 4) what is the gas that is present with the highest percentage in the air a) nitrogen b) oxygen c) hydrogen 5) what is the percentage of oxygen gas in the air? a) 21% b) 18% c) 30%

science

인쇄
퍼가기

순위표

비주얼 스타일

옵션

템플릿 전환하기

자동 저장된 게임을 복구할까요?