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Lena [83]
3 years ago
6

Pls help me I don’t understand it’s for my science class.

Chemistry
1 answer:
Liono4ka [1.6K]3 years ago
5 0

Answer:

Everything is correct except for Gold and Nickel, they are both Elements

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3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.​
tigry1 [53]

The symbol : \tt _{72}^{178}Hf^{+1}

<h3>Further explanation </h3>

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

4 0
3 years ago
A(n)_______is a balanced chemical equation that includes the
Katyanochek1 [597]

Answer:

thermochemical equation

Explanation:

A(n)__thermochemical equation_____is a balanced chemical equation that includes the physical states of all reactants and products, and the energy change that accompanies the reaction.

7 0
3 years ago
What materials are going to use to measure for your data?​
BaLLatris [955]

Answer:

a small unit of measurement used for measuring data is bit.

4 0
4 years ago
An object has a mass of 20 g and displaces a volume of 5 mL. What is the object's density?
lara [203]

Hey There!:

The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:

D = m / V

D = 20 g / 5 mL

D = 4,0 g/mL

hope that helps!


5 0
3 years ago
What is the viscosity and flammability of refinery gas?
Liono4ka [1.6K]
Hydrocarbons

Hope this helps :)
6 0
3 years ago
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