How many valence(outer shell)electrons are present in the atoms of the element with atomic number51(about Chemistry)

How many valence(outer shell)electrons are present in the atoms of the element with atomic number51(about Chemistry) how many how many, 2道英语化学题1.How many single covalent bonds must a nitrogen atom in a neutral molecule form in order to have a complete octet in its valence shell?A)4 B)3 C)2 D)12.什么是monoprotic fluoroacetic? how many how how many books have you sold out so far变被动语态 how many books have been sold out?charlie asked the shopkeeper变成间接引语如题 How many squares of side 3 cm can be cut out from this rectangle?求译 Recently a survey has conducted to find out how many hours 改错急 Can you find out how many people _(show up )at the meeting. look at this picture,please find out how many traingles it has下有图 Can you find out how many people _(show up )at the meeting. How many days a week are you going to fill out Surveys? How many days a week are you going to fill out Surveys? It is surprising to find out( )we like new friends when we get to know them.A.how often B.how long C.how many D.how much How Many Times,How Many Lies 歌词 Have how far out how how many time 与how soon 区别?__will you need to work out the problem?该填什么?为什么?请详细说明可选择项是how long ,how much time ,how soon ,和how fast,改选那个？？？？