God (Visnu) and the individual jiva-souls are together even in every atom in the material creation.

God (Visnu or Narayana) and the jiva-tattvas (the individual jiva-souls) are within every atom.

Therefore within the heart of all living entities and within the atom, God is known as Kshirodakashayi Visnu. 

In Gauḍīya Vaisnavism there are three different forms, or aspects, of Visnu as- 

1 - Maha-Visnu, 

2 - Garbhodakśayī-Viṣṇu

3 - Kṣīrodakaśāyī-Visnu. 

Kṣīrodakaśāyī-Viṣṇu resides in the heart of every living creature as a four hand expansion similar to that of Mahā-Viṣṇu. 

He is also referred to as Paramātmā or super-soul. His abode is the Vaikuṇṭha. 

His personal abode is Kshirasagara (Milk Ocean) and He is realised as Aniruddha expansion of Nārāyaņa.

Visnu/Narayana are expansions of Krsna the Supreme Personality of Godhead and cause of all causes.

Tamala Krsna - "Srila Prabhupada, someone asked a question the other day about the atom which I couldn’t give the answer to. His question is that if we say that within the atom the living entity, the jiva, is present, and life symptoms means six symptoms of birth, growth…"

Srila Prabhupada - "That’s all right. Their life symptoms has not yet come. But there is."

Jayadvaita - "Potential."

Srila Prabhupada - "Yes."

Tamala Krsna - "His question was… It was sort of a dual question. At what time, or what…? Just like at the time of disintegration of this body, the living entity leaves this body and the body disintegrates, so does the atomic body also disintegrate when the living entity leaves it and moves to a higher body?"

Srila Prabhupada - "Atomic body? Atomic body means material body. Unless you are free from this material body, the atomic body will go on with you. That means unless you are mukta, the atomic body will go on. Mind, intelligence, ego — they are also atomic, finer atomic body."

Tamala Krsna - "But within each atom the living entity is present?"

Srila Prabhupada - "Yes. God is present; therefore living entity is present."

Tamala Krsna -"So the living entity is present within the atom just as I am present within this body. When I leave this body, my body breaks apart."

Srila Prabhupada - "Yes, you leave this body, enter another body".

Tamala Krsna -"Right."

Srila Prabhupada - "By nature’s law."

Tamala Krsna -"And when I leave this body, the body breaks apart."

Srila Prabhupada - "Eh?"

Tamala Krsna - "When I leave this body, the body dis…"

Srila Prabhupada - "The body is already atomic combination."

Tamala Krsna "Yes."

 Srila Prabhupada - "So it remains atomic combination. You leave the body."

Tamala Krsna -"Yes. It remains…"

Srila Prabhupada - "You leave the house. That does not mean the house is finished."

Tamala Krsna - "Right, I can understand that."

Hamsaduta - "He’s asking that if the soul leaves the atomic particle, then does the particle break apart. Isn’t it?"

Srila Prabhupada - "No, no. You have not left atomic particle."

Tamala Krsna - "No, but you, you’re… I think you were saying that within the atom there’s also a living entity. So when that living entity leaves the atomic particle does the particle break apart? Or doesn’t it? I mean what…?"

Srila Prabhupada - "Just try to understand. From the sastra, you understand that andantara-stham: “God lives within the atom."

Tamala Krsna - "Yes."

Srila Prabhupada - "And when the God is there, living entity’s also there. This… This much you try to understand. Because God and living entity, they remain together, as two friends. God is trying to save this fallen friend. That is the information from Upanisad. So when God is there, the living entity is also there."

Rupanuga - "So Paramatma and jivatma are always together."

Srila Prabhupada - "Yes."

Pancadravida - "The jivas inside the atom, are they like impersonalists who are in the Brahman?"

Srila Prabhupada - "That you consider. He has not developed his consciousness. Practically, it is like dead." (Morning Walk April 4 1975, Mayapur)