Atoms Elements Compounds Mixtures

Atoms are the smallest unit of an element and are composed of subatomic particles. An atom that has a balanced charge is referred to as “neutral”. Which of the following statements must be true about a neutral atom?

• The atom must have an even number of protons.

• The atom must have as many neutrons as protons.

• The number of electrons and protons in the atom must be equal.

• All of the neutrons and protons are found in the nucleus of an atom.

What can Nathan most likely conclude from these three related but different models?

• There are multiple ways to draw an atom, and all of them are correct.

• No one really knows anything about the structure of an atom.

• Scientists cannot seem to agree on the structure of an atom.

• Scientists build on and modify the work of other scientists.

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NGSS.MS-PS1-1

The smallest piece of matter that still has the properties of an element is a(n) _________________.

• compound

• electron

• atom

• nucleus

Look closely at part of the periodic table shown. Which of the following pairs of elements have properties that are the least similar?

• N and P

• Ge and Br

• He and Xe

• Cl and I

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NGSS.MS-PS1-1

This picture represents which of the following?

• element

• compound

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The circles represent atoms. What is this?

• element

• compound

• mixture of elements and compounds

• mixture of compounds

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NGSS.MS-PS1-1

The circles represent atoms. What is this?

• element

• compound

• mixture of elements and compounds

• mixture of compounds

Tags

NGSS.MS-PS1-1

The circles represent atoms. What is this?

• element

• compound

• mixture of elements

• mixture of compounds

Tags

NGSS.MS-PS1-1

A substance is an ​ (a)   if all the atoms in the substance are the same

• element

• compound

• mixture

• homogeneous

Point to the element, that is made up of a molecule

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NGSS.MS-PS1-1