Answer:
Explanation:
molecular weight of gold = 197
converting 10.2 g into moles
no of moles = 10.2 / 197
= .0518 moles
one mole of any element contains 6.02 x 10²³ number of atoms
.0518 moles will contain 6.02 x .0518 x 10²³ atoms of gold
= .311 x 10²³ no of atoms of gold .
= 3.11 x 10²² no of atoms of gold
Answer:
decreases
Explanation:
Gravirational force is directly proportional to the mass and inversely proportional to the distance.(Newton's law of gravitation)
Explanation:
An atom is made up of:
- Protons which are the positively charged particles
- Electrons are negatively charged
- Neutrons carry no charges.
Atomic number is the number of protons in an atom.
To find the nuclear charge:
We use the effective nuclear charge formula:
Effective nuclear charge = Atomic number - number of shielding electrons(non-valence electrons)
The shielding electrons are the non-valence electrons in the inner orbitals.
For example:
Ne:
atomic number = 10
Effective nuclear charge = 10 - (2) = 8+
Number of non-valence electrons is 2
The effective nuclear charge is 8+
Overall charge:
Charge = number of protons - number of electrons
For neutral atoms, the overall charge is zero as the number of protons and electrons are the same.
Learn more:
Effective nuclear charge brainly.com/question/5441986
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200 kPa. "Pressure." Macmillan Encyclopedia of Physics Reference. 530.03M. Volume 3. New York, New York.1996. pages 1235-1236. "Tire pressure are measured using a rather simple spring gauge, giving readings such as "29", meaning 29 psi." 200 kPa. Bernie, Jacques. Edmonton Bicycle Commuters
You definitely know that is has 56 protons and 56 electrons because atomic number is proton number and protons=electrons
