Question

use your periodic table to fill in the chart and to answer the following questions.
element name | symbol | protons | neutrons | electrons | atomic weight
boron | | | 6 | |

c	6			13
ca				40

iron | | | 30 | |

al

27

13

chromium | | | | | 56

	25	30
	82			207
pt		117

(note: some handwritten contents in the original chart are retained as they are, and the table structure is adjusted for clarity)

Explanation:

Step1: Recall key atomic rules

Protons = Atomic Number = Electrons (neutral atom); Atomic Weight ≈ Protons + Neutrons; Use periodic table for element data.

Step2: Fill Carbon row

Neutrons = Atomic Weight - Protons = $13 - 6 = 7$

Step3: Fill Calcium row

Protons = Atomic Number = 20; Neutrons = $40 - 20 = 20$

Step4: Correct Iron row

Symbol = Fe; Protons = 26; Neutrons = 30, so Atomic Weight = $26 + 30 = 56$; Electrons = 26

Step5: Fill Aluminium row

Protons = 13; Atomic Weight = $13 + 27 = 40$

Step6: Fill Chromium row

Symbol = Cr; Protons = 24; Electrons = 24; Neutrons = $56 - 24 = 32$

Step7: Fix Zinc row

Element Name = Manganese; Symbol = Mn; Electrons = 25; Atomic Weight = $25 + 30 = 55$

Step8: Fill 82-proton row

Element Name = Lead; Symbol = Pb; Electrons = 82; Neutrons = $207 - 82 = 125$

Step9: Fill Platinum row

Element Name = Platinum; Protons = 78; Electrons = 78; Atomic Weight = $78 + 117 = 195$

Step10: Correct Boron row

Atomic Weight = $5 + 6 = 11$

Answer:

Element Name	Symbol	Protons	Neutrons	Electrons	Atomic Weight
Carbon	C	6	7	6	13
Calcium	Ca	20	20	20	40
Iron	Fe	26	30	26	56
Aluminium	Al	13	27	13	40
Chromium	Cr	24	32	24	56
Manganese	Mn	25	30	25	55
Lead	Pb	82	125	82	207
Platinum	Pt	78	117	78	195