What is standard temperature and pressure, or STP? * A. 0°C and 101.3 kPa
B. 0°C and 1 Pa
C. 20°C and 1 Pa
D. 100°C and 101.3 kPa

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom