Final Answer:
a. Iron
b. Iodine
c. Helium
d. Calcium
e. Lead
f. Hydrogen
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If ExplainAnswer is true:
Explanation:
- In a neutral atom, the number of protons = number of electrons.
- The number of protons tells us the atomic number (Z), which identifies the element on the periodic table.
- Neutrons help find the mass number (A = protons + neutrons), but the element is defined by protons only.
Let’s go one by one:
a. 26 protons → atomic number 26 → that’s
Iron (Fe). Electrons = 26 confirms it’s neutral.
b. 53 protons → atomic number 53 → that’s
Iodine (I). Neutrons don’t change the element.
c. 2 electrons in a neutral atom → so 2 protons → atomic number 2 →
Helium (He).
d. 20 protons → atomic number 20 →
Calcium (Ca). (Electrons not given, but protons alone identify the element.)
e. 82 protons → atomic number 82 →
Lead (Pb). Electrons = 86 means it’s an ion (charge = −4), but the element is still lead.
f. 0 neutrons — only possible for hydrogen-1 (¹H), the most common isotope of
Hydrogen, which has 1 proton, 0 neutrons, and usually 1 electron. Since no protons are listed, but 0 neutrons alone isn’t enough—however, the only stable atom with 0 neutrons is hydrogen-1, and the context implies we’re looking for the element with *no neutrons*, which is hydrogen. (Note: This part assumes the atom has 1 proton — otherwise, 0 protons + 0 neutrons would be nothing. But standard interpretation: “0 neutrons” in this context points to hydrogen-1.)
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If TeachTopic is true:
Teach the Topic:
Atoms are made of three particles: protons (positive), electrons (negative), and neutrons (no charge).
The number of
protons decides what element it is — like a fingerprint. For example, any atom with 6 protons is carbon, no matter how many neutrons or electrons it has.
In a neutral (uncharged) atom, protons = electrons. If electrons ≠ protons, it’s an ion (charged atom).
Neutrons can vary — same element can have different numbers of neutrons; these versions are called isotopes.
Simple example:
An atom has 8 protons and 8 electrons. What element is it?
→ 8 protons = atomic number 8 → Oxygen. Easy!
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If GeneratePractice is true:
Practice Task:
Name the element with:
a. 11 protons
b. 17 protons, 18 electrons
c. 1 proton, 0 neutrons
d. 79 protons, 118 neutrons
Parent Tip: Review the logic above to help your child master the concept of basic atomic structure worksheet answers.
