STAAR Atoms Questions

Which statement accurately describes the atoms of a specific element?

• An Indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A Scandium, Sc, contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An Aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.

• A Zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

Tags

NGSS.MS-PS1-1

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

What is the total number of protons, neutrons, and electrons in a Cadmium, Cd, atom that has a mass number of 112?

• 112

• 160

• 48

• 64

What is the difference between the number of electrons in an atom of Selenium, Se, and the number of electrons in a atom of Aluminum, Al?

• 21

• 34

• 13

• 47

How many protons, neutrons, and electrons are present in an atom of Hafnium, Hf, with a mass number of 178?

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

NGSS.MS-PS1-1

Atoms of which two elements have a combined total of 23 protons?

• Sodium (Na) and Magnesium (Mg)

• Boron (B) and Carbon (C)

• Copper (Cu) and Zinc (Zn)

• None of these

The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom. In this model, which particle determines the reactivity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

Tags

NGSS.MS-PS1-1

A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?

• Neon, because it has two energy levels with eight electrons in the second level

• Chlorine, because it has three energy levels with seven electrons in the third level

• Gallium, because it has four energy levels with three electrons in the fourth level

• Tin, because it has five energy levels with four electrons in the fifth level

Tags

NGSS.MS-PS1-1

Four students were asked to name the parts of an atom that determine the atom's identity and chemical properties. The students' responses are shown in the table below. Which student's response is correct?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

Tin, Sn, is a soft white metal. It has a low melting point compered with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of Tin?

• Tin atoms have 50 protons.

• Tin atoms have five valence electrons.

• Tin atoms have 119 neutrons.

• Tin atoms have 68 electrons.

Tags

NGSS.MS-PS1-1