what determines the number of neutrons in an atom?
what is the mass number of an atom that has 28 neutrons?请在5月
A story about atom.(A day in the life of an atom)全英文,文章,不是题目
How fast of the speed of the electron which in an atom?
I'm an atom in a sea of nothing是什么意思
英语翻译To what extent competition determines the composition of
An atom with a mass number of 196 has 40 fewer protons than
-What ___ the number of the students in your school?
--What ________ the number of the students in your school?
英语翻译What do you think determines an employee ) progress in a
英语翻译an increase in the number of people committing suicide
Electron occupy most of the space of an atom.True or False?
sat2化学普林斯顿的化学 The electron cofiguration for an atom of the e