Oxygen is formed from carbon dioxide in , while carbon dioxide is formed from oxygen in

Oxygen is formed from carbon dioxide in photosynthesis, while carbon dioxide is formed from oxygen in  cellular respiration.

Explanation:

Photosynthesis is a process performed by plants ( primary producers) in which energy from sunlight is used. Photosynthesis involves the sunlight, CO2 and water to produce glucose and oxygen.

Excess amount of carbon dioxide is removed from the environment by photosynthesis and is preventing global warming.

Photosynthesis occur in chloroplasts present in the mesophyll of the green leaves.

Stomata allows intake of carbon dioxide and outflow of oxygen from the pores.

Two reactions takes place light dependent and light independent reaction takes place to form glucose and oxygen.

6 + 6 ⇔ +    Chemical equation of photosynthesis.

Respiration is a process in which glucose molecule is broken down in the cells in the presence of oxygen releasing energy in the form of ATP.

The food when eaten and absorbed in the body as glucose is the raw material for respiration.

+ ⇒ + O + + 38 ATP

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.