Please Help 1. What is the parent isotope when Rn-218 is formed as a result of an alpha decay? A. At-212
B. Ra-88
C. Ra-222
D. Ac-228

2. What is the parent isotope when Holmium-166 is formed during an alpha decay?

A. Tm-170
B. Er-170
C. Tb-160
D. Dy-164

Which metal exist in liquid state and can be cut with knife ?

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.