Alpha emission in an atom reduces its atomic number by two. An alpha particle is actually the nucleus of a helium-4 atom.   In alpha decay, atomic number decreases by 2, and atomic mass decreases by 4.  .   An alpha particle is two protons and two neutrons, this is the same as a helium nucleus.
On most PraxisÂ® tests, each selected-response question answered. correctly is worth one raw point, and your total raw score is the. number of questions answered correctly on the full test. Selected-. response questions are scored by computer.
Let's take a look. 1  Find your raw score on the Reading section. This is just the total amount of questions you answered correctly. 2  To continue with my example, let's stay with Practice Test 1. Let's say I correct the Reading section and find that I got 39 questions right. 3  Find your raw score on the Writing section.