List down some examples of matters based on its physical state (Solid,

The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha p

Mariana [72]

Answer: The given statement is false.

Explanation:

When there is more difference in the ratio or number of protons and neutrons then nucleus of the atom becomes unstable in nature. This unstability is caused due to greater repulsion between the like charges of sub-atomic particles.

As a result, this force of repulsion becomes greater than the binding energy. And, this force is known as the weak force because it is unable to bind the neutrons and protons together.

The proton and neutron ratio for smaller elements is 1:1 and for higher elements it has to be 1:5. Since, $^{8}Be$ is a smaller element with 4 protons and 4 neutrons. Hence, the proton and neutron ratio is 1:1.

Therefore, $^{8}Be$ is stable in nature.

Thus, we can conclude that the statement nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons), is false.

5 0

3 years ago

3. Assume that a sample decays with a given half-life. Will you be able to observe when the sample has completely decayed? Why o

alexdok [17]

Answer:

demRafi is working odd jobs to save enough money to buy a new phone. Last month, he earned $125 raking leaves for his neighbors. This month, there was a big snowstorm. Rafi earned $235 shoveling snow!

How much money did Rafi earn altogether?Rafi is working odd jobs to save enough money to buy a new phone. Last month, he earned $125 raking leaves for his neighbors. This month, there was a big snowstorm. Rafi earned $235 shoveling snow!

How much money did Rafi earn altogether?

Explanation:lm

4 0

3 years ago

Which of the following elements could be described as least reactive, relative to the other three answer choices?

Tju [1.3M]

The correct Answer Should be Gold/AU

5 0

3 years ago

The volume of a container is 40 cm3. It has a length of 4 cm, a width of 2 cm. What is the height of the container?

PtichkaEL [24]

5cm
4x2 =8, 8x5 =40
so 4 x 2 x 5 = 40cm3

7 0

3 years ago

Read 2 more answers

Give the name and formula of the compound formed from the following elements: a) Sodium and nitrogen b) Oxygen and strontium c)

elena-s [515]

Answer: a) Sodium and nitrogen : $NaN_3$ : sodium nitride.

b) Oxygen and strontium : $SrO$ : strontium oxide.

c) Aluminum and chlorine : $AlCl_3$ : aluminium chloride.

d) Cesium and bromine : $CsBr$ : cesium bromide.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

a) Sodium and nitrogen : Here sodium is having an oxidation state of +1 called as $Na^{+}$ cation and nitrogen forms an anion $N^{3-}$ with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $NaN_3$ named as sodium nitride.

b) Oxygen and strontium : Here strontium is having an oxidation state of +2 called as $Sr^{+}$ cation and oxygen forms an anion $O^{2-}$ with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $SrO$ named as strontium oxide.

c) Aluminum and chlorine : Here aluminium is having an oxidation state of +3 called as $Al^{3+}$ cation and chlorine forms an anion $Cl^{-}$ with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $AlCl_3$ named as aluminium chloride.

d) Cesium and bromine : Here cesium is having an oxidation state of +1 called as $Cs^{+}$ cation and bromine forms an anion $Br^{-}$ with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $CsBr$ named as cesium bromide.

7 0

3 years ago