Atomic structure

a substance that has a mass and fills up a space is known as ----

• atom

• matter

• element

• compound

the number of elements in the modern periodic table is----

• 120

• 119

• 116

• 118

a central core part in the atom is known as

• electrons

• nucleus

• protons

• neutrons

an atom is a tiny particle however it contains other particles and these are called

• neutrons

• substances

• protons

• subatomic particles

a negatively charged particles rotating around the nucleus

• protons

• electrons

• neutrons

• positron

nucleon number is also known as ----------

the number of protons in the nucleus of neutral atom is representing the number of

• protons

• neutrons

• electrons

• positrons

imaginary places in the atom where electrons are rotating are called

• center core

• energy levels

• sub levels

a positively charged particles in the atom are known as------

• protons

• electrons

• nucleons

• neutrons

Na is representing the chemical symbol for---

• neon

• nitrogen

• nickel

• sodium