Question

what is an atom. Pls​

Answer 1

We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks. Atoms were created after the Big Bang 13.7 billion years ago. ... Quarks came together to form protons and neutrons, and these particles combined into nuclei.

Answer 2

Answer:

An atom is the smallest unit of matter that has the properties of an element. It is composed of a dense core called the nucleus and a series of outer shells occupied by orbiting electrons. The nucleus, composed of protons and neutrons, is at the center of an atom. 353 views. View upvotes.

Explanation:

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