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pshichka [43]
3 years ago
7

What thorium has 90 protons and 137 neutrons?

Chemistry
2 answers:
faltersainse [42]3 years ago
6 0

Answer : The representation of thorium isotope is ^{227}_{90}Th

Explanation :

Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

Isotope notation : It is also called as nuclear notation. In isotopic notation we can easily determine an isotope's mass number, atomic number, the number of neutrons and protons in the nucleus.

The general isotopic representation of an atom is:

_Z^A\textrm{X}

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

As we given:

Number of protons = 90

Number of neutrons = 137

Atomic number = number of protons = 90

Mass number = Number of neutrons + Number of protons

Mass number = 137 + 90

Mass number = 227

The symbol of thorium = Th

Thus, the representation of thorium isotope is ^{227}_{90}Th

Ket [755]3 years ago
5 0
<span> a silvery white metal which maintains its luster for several months unless it </span>is<span> exposed to oxygen and then it eventually turns black. </span>
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Reaction of sodium with water

Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic. During the reaction, the sodium metal may well become so hot that it catches fire and burns with a characteristic orange colour. The reaction is slower than that of potassium (immediately below sodium in the periodic table), but faster than that of lithium (immediately above sodium in the periodic table).

2Na(s) + 2H2O → 2NaOH(aq) + H2(g)

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A battery can provide a current of 4.60 A at 3.40 V for 2.50 hr. How much energy (in kJ) is produced? 1st attempt kJ Energy
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Answer:

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This is true!!!!!!!!!!!!!!!!!!!!!!!!
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