Free Printable Periodic Table Worksheets - Free Printable

Let's solve the problems step by step:

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Problem 1: What is the element symbol for Californium?

- Californium is a synthetic element with the atomic number 98.
- Its symbol is Cf.

Answer: Cf

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Problem 2: How many protons are present in an atom of Bismuth?

- Bismuth is a naturally occurring element with the atomic number 83.
- The atomic number represents the number of protons in the nucleus of an atom.

Answer: 83

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Problem 3: To which group element does Argon belong?

- Argon (Ar) is a noble gas.
- Noble gases are located in Group 18 (the far-right column) of the periodic table.

Answer: Group 18

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Problem 4: All families have the same number of ______ electrons.

- In the periodic table, elements in the same family (or group) have the same number of valence electrons.
- Valence electrons are the electrons in the outermost shell that participate in chemical bonding.

Answer: valence

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Problem 5: Nobel gases have a ______ valence shell.

- Nobel gases (also called inert gases) are highly stable because their outermost electron shell is completely filled.
- This means they have a stable or full valence shell.

Answer: stable/full

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Problem 6: Alkaline-earth metals are the elements in the ______ column.

- Alkaline-earth metals are located in Group 2 of the periodic table.
- They are the second column from the left.

Answer: 2

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Problem 7: Write down the element from the set that matches the given criteria.

#### Criteria 1: Largest size
- We need to compare the sizes of Chlorine (Cl), Sodium (Na), Silicon (Si), and Aluminum (Al).
- Atomic radius generally increases as you move down a group and decreases as you move across a period from left to right.
- Among these elements:
- Sodium (Na) is in Period 3 and Group 1.
- Chlorine (Cl) is in Period 3 and Group 17.
- Silicon (Si) is in Period 3 and Group 14.
- Aluminum (Al) is in Period 3 and Group 13.
- Since Na is in Group 1, it has the largest atomic radius among these elements.

Answer: Sodium (Na)

#### Criteria 2: Highest electronegativity
- Electronegativity generally increases as you move across a period from left to right and decreases as you move down a group.
- We need to compare Calcium (Ca), Beryllium (Be), Radium (Ra), and Magnesium (Mg).
- Among these elements:
- Calcium (Ca) and Magnesium (Mg) are in Group 2.
- Beryllium (Be) is in Group 2 but in Period 2.
- Radium (Ra) is in Group 2 but in Period 7.
- Beryllium (Be) has the highest electronegativity because it is the smallest in size and closest to the top-right corner of the periodic table among these elements.

Answer: Beryllium (Be)

#### Criteria 3: Ionization energy
- Ionization energy generally increases as you move across a period from left to right and decreases as you move down a group.
- We need to compare Calcium (Ca), Bromine (Br), Arsenic (As), and Iron (Fe).
- Among these elements:
- Calcium (Ca) is in Group 2.
- Bromine (Br) is in Group 17.
- Arsenic (As) is in Group 15.
- Iron (Fe) is in Group 8.
- Bromine (Br) has the highest ionization energy because it is in Group 17, which is closer to the top-right corner of the periodic table.

Answer: Bromine (Br)

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Final Answers:

1. Cf
2. 83
3. Group 18
4. valence
5. stable/full
6. 2
7.
- Largest size: Sodium (Na)
- Highest electronegativity: Beryllium (Be)
- Ionization energy: Bromine (Br)

Boxed Final Answer:
\[
\boxed{Cf, 83, \text{Group 18}, \text{valence}, \text{stable/full}, 2, \text{Sodium (Na), Beryllium (Be), Bromine (Br)}}
\]