What is the process occurs when iodine is heated?
The graph shows ____________________________.
This graph will occur when _______________.
Which of the following is true?
Rate of diffusion can be increased by ___________________
Which of the following has the highest rate of diffusion?
during the melting process, the substance exist in ________________.
Which two substances have the same number of valence electrons?
Proton number of A: 8
Proton number of Z: 6
Proton number of D: 16
Proton number of X: 11
The nucleon number of element A is 20. It contains 9 protons. What is the number of electron?
Who discovered proton?
Which isotope is used to detect the leaks in underground pipes?
Isotopes have the same ___________________ .