7. give the symbol and number of protons in one atom of: lithium ______________ bromine ______________ iron…
7. give the symbol and number of protons in one atom of: lithium ______________ bromine ______________ iron ______________ copper ______________ oxygen ______________ mercury ______________ krypton ______________ helium ______________ 8. give the symbol and number of electrons in a neutral atom of: uranium ______________ chlorine ______________ boron ______________ iodine ______________ antimony ______________ xenin ______________
Answer
Explanation:
Step1: Recall periodic - table properties
The atomic number of an element is equal to the number of protons in an atom. In a neutral atom, the number of electrons is equal to the number of protons. We use the periodic table to find the symbol and atomic number of each element.
Step2: Lithium
Symbol: Li, Number of protons = 3
Step3: Iron
Symbol: Fe, Number of protons = 26
Step4: Oxygen
Symbol: O, Number of protons = 8
Step5: Krypton
Symbol: Kr, Number of protons = 36
Step6: Bromine
Symbol: Br, Number of protons = 35
Step7: Copper
Symbol: Cu, Number of protons = 29
Step8: Mercury
Symbol: Hg, Number of protons = 80
Step9: Helium
Symbol: He, Number of protons = 2
Step10: Uranium
Symbol: U, Number of protons (and electrons in neutral atom) = 92
Step11: Boron
Symbol: B, Number of protons (and electrons in neutral atom) = 5
Step12: Antimony
Symbol: Sb, Number of protons (and electrons in neutral atom) = 51
Step13: Chlorine
Symbol: Cl, Number of protons (and electrons in neutral atom) = 17
Step14: Iodine
Symbol: I, Number of protons (and electrons in neutral atom) = 53
Step15: Xenon (assuming you mean Xenon instead of Xenin)
Symbol: Xe, Number of protons (and electrons in neutral atom) = 54
Answer:
Lithium: Li, 3 Iron: Fe, 26 Oxygen: O, 8 Krypton: Kr, 36 Bromine: Br, 35 Copper: Cu, 29 Mercury: Hg, 80 Helium: He, 2 Uranium: U, 92 Boron: B, 5 Antimony: Sb, 51 Chlorine: Cl, 17 Iodine: I, 53 Xenon: Xe, 54