Question

atoms family ii name: label the parts of lithium tile
emember to find neutrons = mass - atomic number first, we need to round the mass to a whole number. if the number after the decimal is below 5, round down, if the number is above 5, round up to the next number. for example, 5.21 rounds to 5 and 6.941 rounds up to 7 atomic mass atomic number protons (+) electrons (-) neutrons (0) lets practice rounding to whole numbers: 70.335 → ____ 70.521 → ____

Explanation:

Step1: Label the lithium tile parts

• Rightmost arrow (3): Atomic Number
• Arrow to Li: Chemical Symbol
• Arrow to Lithium: Element Name
• Arrow to 6.941: Atomic Mass

Step2: Round 70.335 to whole number

Check tenths place: 3 < 5, round down.
$70.335
ightarrow 70$

Step3: Round 70.521 to whole number

Check tenths place: 5 ≥ 5, round up.
$70.521
ightarrow 71$

Step4: Calculate neutrons for lithium

Round atomic mass 6.941 to 7. Use formula: $\text{Neutrons} = \text{Rounded Mass} - \text{Atomic Number}$
$7 - 3 = 4$

Step5: Match subatomic particles

• Protons (+): Equal to atomic number = 3
• Electrons (-): Equal to protons = 3
• Neutrons (○): 4

Answer:

Lithium Tile Labels (from right to left):

1. Atomic Number
2. Chemical Symbol (Li)
3. Element Name (Lithium)
4. Atomic Mass

Rounding Practice:

$70.335
ightarrow 70$
$70.521
ightarrow 71$

Subatomic Particles for Lithium:

• Protons: 3
• Electrons: 3
• Neutrons: 4