CHEMISTRY HIGH SCHOOL

The valence electrons in an atom of phosphorusin the ground state are all found in
(1) the first shell
(2) the second shell
(3) the third shell
(4) the fourth shell

Answers

Answer 1
Answer:

The valence electrons in an atom of phosphorus in the ground state are all found in IN THE THIRD SHELL.

Phosphorus has an atomic number of 15, therefore its electronic configuration is 2, 8, 5. This configuration implies that, phosphorus electrons are distributed in three different shells and the number of electrons in the outermost shell, which is the third shell, is 5. The ground state refers to a state, where the atoms of phosphorus are not excited. Electrons move away from their ground states when they are excited.
Answer 2
Answer: The answer to this question is 3

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What is the name for Na20?

Answers

It is called disodium oxide :) 
The name for Na2O is Disodium Oxide 

In order to observe a property of a substance, the substance must interact with another substance, such as when gasoline burns or when sodium metal reacts with water.

Answers

Observing a property of a substance can be done through experiments. Most of these experiments are done by a chemical reaction. A chemical reaction involves two substances interacting with each other. However, not all property of a substance can only be observed through a reaction. Like melting experiment, freezing point determination and boiling point determination, only heat is added or is removed to the substance in order to see that certain property.

answer:

chemial

Explanation:

chemical reactions include the reactivity of an object. physical properties do not include reactivity and electrical and thermal properties are not reactivity either

How does the Law of Conservation of Mass relate to changes in physical state? How does it relate to chemical changes?

Answers

The Law of Conservation of Mass states that matter cannot be created nor destroyed. It can only be transformed from one state or substance to another. This means that this law applies to both physical and chemical changes. In physical changes, the substance before and after the phase change still has the same mass. In chemical changes, the mass of reactants will always have the same mass of products and by-products.

What is used up in and stops a chemical reaction?

Answers

Answer:

This question is incomplete but the completed question is below

What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant

The correct option is (b)

Explanation:

A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).

A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.

Hi

The chemical reaction does not stop until the reagent is used .


I hope that's help !

In the late 1800s, the British scientist J. J. Thomson discovered that atoms were composed of positively-charged and negatively-charged particles. He proposed that these two types of particles were evenly mixed throughout the structure of the atom. How does this atomic model differ from current atomic models?A. Current atomic models show that atoms do not have positively-charged particles.

B. Current atomic models show an atom's positively-charged particles concentrated in the center of the atom.

C. Current atomic models show that atoms do not have negatively-charged particles.

Answers

Option B.

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Predict what happens when zinc is added to water

Answers

As far as I know Zinc doesn't react with water, but I'm not sure. If it were, Zinc hydroxide and hydrogen would be the products, so it only happens if Zinc is more reactive than hydrogen.

Answer:

Zinc doesn't react with water.

Explanation:

It forms a layer of insoluble zinc hydroxide.
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