Answer:
chemical composition
Explanation:
changes into any state of matter are physical and thus the chemical composition of the matter is unaltered
Answer:
Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons
Geometry name is trigonal bypyramidal
non-polar
Answer:
the correct answer is four decimal places
The alpha particle is the helium nucleus.
The mass of helium nucleus (⁴₂He) is 4u.
The mass of radioactive atom decreases by 4u. Look at the reaction below:
²²³₈₈Ra ---> ⁴₂He + ²¹⁹₈₆Rn