Atomic Theory and Periodic Table

From left to right, are the numbers (130.5℃, 141.1℃, 156.09℃, 160℃, 184.5℃) increasing or decreasing

• Increasing

• Decreasing

From left to right, are the numbers (4℃, 0℃, -3℃, -7℃, -8.5℃, -10℃) increasing or decreasing?

• Increasing

• Decreasing

Look at the diagram above. Pictured are three atoms of the same element. We know this because each atom has only one proton. Which of the following statements is therefore accurate.

• Two atoms of the same element can differ in the number of protons, neutrons, or electrons.

• Two atoms of the same element can differ in only in the number of protons or electrons.

• Two atoms of the same element can differ in only in the number of neutrons or electrons.

• Two atoms of the same element can differ in only in the number of protons and neutrons.

Tags

NGSS.MS-PS1-1

Look at the diagram above. Pictured are a Hydrogen and a Gold atom. Both Hydrogen and Gold are Neutral Atoms. Which of the following defines a neutral atom?

• A neutral atom has equal numbers of protons and electrons.

• A neutral atom has equal numbers of neutrons and electrons.

• A neutral atom has equal numbers of protons and neutrons.

• A neutral atom has different numbers of protons, neutrons and electrons.

Tags

NGSS.MS-PS1-1

Which statement about sub-atomic particles is accurate?

• protons are lighter than neutrons

• neutrons are lighter than electrons

• both protons and neutrons are heavier than electrons

• Electrons are heavier than both protons and neutrons

All atoms have a ___________ charged nucleus, surrounded by a ___________ charged cloud.

• positively; negatively

• positively; positively

• negatively; negatively

• negatively; positively

Tags

NGSS.MS-PS1-1

Kathryn is making a model of a lithium atom with food! A lithium atom has three protons, four neutrons, and three electrons. She has a small bowl and some cooked spaghetti noodles. She also has peanuts, raisins, and uncooked grains of rice. If she uses the bowl as the nucleus, what items should she place inside the bowl?

• She should place three peanuts and three grains of rice inside the bowl.

• She should place three grains of rice and three raisins inside the bowl.

• She should place three peanuts and four grains of rice inside the bowl.

• She should place three peanuts and four raisins inside the bowl.

Tags

NGSS.MS-PS1-1

Kathryn is making a model of a lithium atom with food! A lithium atom has three protons, four neutrons, and three electrons. She has a small bowl and some cooked spaghetti noodles. She also has peanuts, raisins, and uncooked grains of rice. Which items should she place outside the bowl?

• Two spaghetti noodles and three grains of rice

• One spaghetti noodle and two grains of rice

• Two spaghetti noodles and three peanuts

• One spaghetti noodles and two raisins

Tags

NGSS.MS-PS1-1

How many neutrons does the atom of hydrogen have?

(a)  

Tags

NGSS.MS-PS1-1

How many neutrons does the atom of helium have?

(a)