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motikmotik
3 years ago
6

I need this please my brain hurts

Chemistry
1 answer:
GarryVolchara [31]3 years ago
5 0
8.4 grams. I think but I’m not 100% sure
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How do I convert 498.82 cg to mg
Rus_ich [418]
498.82 cg ( mg
4988.2 mg
6 0
3 years ago
Read 2 more answers
Help me (number 5).
olga55 [171]

Answer:

a. HF

Explanation:

6 0
2 years ago
I need your help!! about Chemistry (15 point!!)
irakobra [83]
1. I think it is true?
2. Low melting points
3. True
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6 0
2 years ago
Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.
nikdorinn [45]

Answer:

Number of protons = 82

Explanation:

Given data:

Atomic number of Pb = 82

Mass number of Pb-207 = 207

Number of protons = ?

Solution:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Atomic number of Pb = number of protons or electrons

82 = number of protons or electrons

Mass number = Number of protons + number of neutron

207 = 82 + number of neutron

Number of neutrons = 207 - 82

Number of neutrons = 125

5 0
2 years ago
Which part of the atom has to stay the same for it to be the same element? number of neutrons
kolezko [41]
For it to be the same element it must contain the same number of protons
5 0
3 years ago
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