Chemistry

4. I am a gas with 8 protons and 8 neutrons.
5. A change of color or temperature can be a sign of a ______ change.
9. Chromium-55 is _____ abundant than Chromium-52.
10. I am the first element in the 4th period.
11. Salad is an example of a _______ mixture.
15. Isotopes of an element have the same number of protons but different number of _____.
17. My atomic mass is 35.453
20. I am a metal that is liquid at room temperature.
22. This metalloid has an atomic mass of 28.08

1. Saltwater is an example of a _____ mixture.
2. Melting is an example of a _________ change.
3. Beryllium-9 has ______ protons and 5 neutrons.
6. Zinc is this type of pure substance.
7. I am a member of the alkaline earth metals in period 4.
8. Sulfur-32 is ______ abundant than Sulfur-35.
12. You can find me in the group 14 in period 5.
13. My atomic number is 79.
14. Carbon 13 has 6 protons and ______ neutrons.
16. I have 26 protons.
18. I am not really an alkali metal, but since I have only 1 electron I behave like them.
19. H2SO4 is this type of pure subtance.
21. I am a gas with a mass number of 19.