You fire a beam of light at a peice of metal and determine that electrons are emitted with 2.0 eV of energy. You increase the wavelength of the lightband determine that electrons are still being emitted .what else is true A) there is an increse the speed of the emitted electrons

B) there is a decrease the speed of the emitted electrons

C) there is an increse the number of electrons emitted

D) there is a decrease the number of electrons emitted

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

i think its 100

i hope this !