1. Isotopes Warm-up
Write the hyphen notation and nuclear symbol for the isotopes below.
12 p+
12 no
12 p+
14 no
2. A atom has 26 protons and 30 neutrons in its nucleus. What are the hyphen notation and nuclear symbol for this element?
3. A atom has 26 protons and 31 neutrons in its nucleus. What are the hyphen notation and nuclear symbol for this element?
4. What are the atoms called in Questions #2 and #3?

2. Isotopes Warm-up Mg Mg Magnesium-24 Magnesium-26 12 24 12 26
Write the hyphen notation and nuclear symbol for the isotopes below.
12 p+
12 no
12 p+
14 no
Magnesium-24
Magnesium-26 Mg 12 24 Mg 12 26

3. Isotopes Warm-up Fe Fe Iron-56 56 26 Iron-57 57 26 isotopes
2. A atom has 26 protons and 30 neutrons in its nucleus. What are the hyphen notation and nuclear symbol for this element?
Iron-56 Fe 26 56
3. A atom has 26 protons and 31 neutrons in its nucleus. What are the hyphen notation and nuclear symbol for this element?
Iron-57 Fe 26 57
4. What are the atoms called in Questions #2 and #3?
isotopes

4. Important Information
Unit 4: Splitting & Unstable Matter: Atoms & Nuclear Chemistry Quiz on 10/8 (A) or 10/9 (B)
Unit 4: Splitting & Unstable Matter: Atoms & Nuclear Chemistry Test on 10/10 (A) or 10/11 (B)
Homework: Radioactivity HW (due on 10/4 (A) or 10/7 (B)
All late work is due by Friday, 10/4 by 4 pm. NO EXCEPTIONS! All tests and retest are in the Co-op. Please take as soon as possible. Must be taken by Friday, 10/4 by 4 pm.