Chemistry
| Front | What is uncertainty? |
| Back | resolution/2 |
| Front | What is electron impact ionisation? |
| Back | Used for elements and low Mr compounds. Fragmentation often occurs.High energy electrons are bombarded at the gaseous sample with an electron gun. An electron is knocked off each particle by the high energy electrons to form 1+ ions. |
| Front | What is the general trend in first ionisation energy across a period? |
| Back | First ionisation energy increases across a period because the outer electrons are in the same shell so the shielding of the nuclear atttraction stays the same. The number of protons in the nucleus increases across a period. Therefore, there is a stronger attraction between the nucleus and outer electrons making it harder to lose an electron. |